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Tobacco dependence

Héctor Cervera, Santiago F Elena
A long-standing observation in evolutionary virology is that RNA virus populations are highly polymorphic, composed by a mixture of genotypes whose abundances in the population depend on complex interaction between fitness differences, mutational coupling and genetic drift. It was shown long ago, though in cell cultures, that most of these genotypes had lower fitness than the population they belong, an observation that explained why single-virion passages turned on Muller's ratchet while very large population passages resulted in fitness increases in novel environments...
January 2016: Virus Evolution
Yuyan Shi, John P Pierce, Martha White, Maya Vijayaraghavan, Wilson Compton, Kevin Conway, Anne M Hartman, Karen Messer
BACKGROUND: Electronic cigarettes (e-cigarettes) are heavily marketed and widely perceived as helpful for quitting or reducing smoking intensity. We test whether ever-use of e-cigarettes among early adopters was associated with: 1) increased cigarette smoking cessation; and 2) reduced cigarette consumption. METHODS: A representative cohort of U.S. smokers (N = 2454) from the 2010 Tobacco Use Supplement to the Current Population Survey (TUS-CPS) was re-interviewed 1 year later...
October 21, 2016: BMC Public Health
Benjamin H Han, Scott Sherman, Pia M Mauro, Silvia S Martins, James Rotenberg, Joseph J Palamar
BACKGROUND AND AIMS: The ageing United States (US) population is providing an unprecedented population of older adults who use recreational drugs. We aimed to estimate the trends in the prevalence of past-year use of cannabis, describe the patterns and attitudes, and determine correlates of cannabis use by adults age 50 and older. DESIGN: Secondary analysis of the National Survey on Drug Use and Health survey from 2006 to 2013, a cross-sectional survey given to a nationally representative probability sample of populations living in US households...
October 21, 2016: Addiction
Abdullah Turhan, Simone Onrust, Peter Ten Klooster, Marcel Pieterse
AIMS: To test effectiveness of the Healthy School and Drugs (HSD) program on tobacco and alcohol use in Dutch secondary special education (SE) schools, and whether this depends on subtypes of SE-schools and the level of implementation. DESIGN: In a quasi-experimental design with baseline and post-treatment follow-up 35 classes (N = 363) were allocated arbitrarily or depending on teacher motivation to either intervention condition (N = 205) or usual curriculum (N = 158)...
October 21, 2016: Addiction
Jack E Henningfield, Tracy T Smith, Bethea A Kleykamp, Reginald V Fant, Eric C Donny
BACKGROUND AND RATIONALE: Steven R. Goldberg was a pioneering behavioral pharmacologist whose intravenous drug self-administration studies advanced the understanding of conditioned stimuli and schedules of reinforcement as determinants of pattern and persistence of drug-seeking behavior, and in particular, the importance of nicotine in tobacco use. His passing in 2014 led to invitations to contribute articles to psychopharmacology dedicated to his work. OBJECTIVES: The objectives of this review are to summarize and put into historical perspective Goldberg's contributions to elucidate the reinforcing effects of nicotine and to summarize the implications of his research for medication development, tobacco regulation, and potential tobacco control policy options...
October 21, 2016: Psychopharmacology
Jens Christoffer Skogen, Tormod Bøe, Børge Sivertsen, Mari Hysing
OBJECTIVE: To describe potential differences in unhealthy behaviours among ethnic Norwegian adolescents and minority adolescents from countries within the European Union, European Economic Area or US (EU/EEA countries) and adolescents from non-EU/EEA countries. Specifically, we aimed to investigate ethnic differences in use of alcohol, tobacco and illicit drugs, and potential confounding due to socio-demographic characteristics. DESIGN: Cross-sectional population-based study of adolescents aged 16-19 (N = 10,122), with self-reported ethnicity as grouping variable, and self-reported use of alcohol, tobacco and illicit drugs as dependent variables...
October 21, 2016: Ethnicity & Health
Nashmiah Aid Alrashedy, Jeanmaire Molina
Psychoactive plants contain chemicals that presumably evolved as allelochemicals but target certain neuronal receptors when consumed by humans, altering perception, emotion and cognition. These plants have been used since ancient times as medicines and in the context of religious rituals for their various psychoactive effects (e.g., as hallucinogens, stimulants, sedatives). The ubiquity of psychoactive plants in various cultures motivates investigation of the commonalities among these plants, in which a phylogenetic framework may be insightful...
2016: PeerJ
Yue Zhang, Richard Potter, William Zhang, Zahra Fakhraai
Recent studies have shown that diffusion on the surface of organic glasses can be many orders of magnitude faster than bulk diffusion. Developing new probes that can readily measure surface diffusion can help study the effect of parameters such as chemical structure, intermolecular interaction, molecules' shape and size on the enhanced surface diffusion. In this study, we develop a novel probe that significantly simplifies these types of studies. Tobacco mosaic virus (TMV) is used as probe particle to measure surface diffusion coefficient of molecular glass N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD)...
October 19, 2016: Soft Matter
Min Liu, Jinshan Jin, Hongmiao Pan, Jinhui Feng, Carl E Cerniglia, Maocheng Yang, Huizhong Chen
To evaluate the toxicity of smokeless tobacco products (STPs) on oral bacteria, seven smokeless tobacco aqueous extracts (STAEs) from major brands of STPs and three tobacco-specific N-nitrosamines (TSNAs) were used in a growth and viability test against 38 oral bacterial species or subspecies. All seven STAEs showed concentration-dependent effects on the growth and viability of tested oral bacteria under anaerobic culture conditions, although there were strain-to-strain variations. In the presence of 1 mg/ml STAEs, the growth of 4 strains decreased over 0...
October 15, 2016: Anaerobe
Xiefeng Ye, Tianxiao Ling, Yanfeng Xue, Cunfa Xu, Wei Zhou, Liangbin Hu, Jian Chen, Zhiqi Shi
Thymol is a famous plant-derived compound that has been widely used in pharmacy due to its antioxidant and antimicrobial properties. However, the modulation of intrinsic plant physiology by thymol remains unclear. It is a significant challenge to confer plant tolerance to Cd (cadmium) stress. In the present study physiological, histochemical, and biochemical methods were applied to investigate thymol-induced Cd tolerance in tobacco (Nicotiana tabacum) seedlings. Thymol was able to alleviate Cd-induced growth inhibition of tobacco seedlings in both dose- and time-dependent manners...
October 14, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Yin Song, Bart P H J Thomma
Verticillium wilt, caused by soil-borne fungi of the genus Verticillium, is an economically important disease that affects a wide range of host plants. Unfortunately, host resistance against Verticillium wilts is not available for many plant species, and the disease is notoriously difficult to combat. Host-induced gene silencing (HIGS) is an RNA interference (RNAi) based process in which small RNAs are produced by the host plant to target parasite transcripts. HIGS has emerged as a promising strategy for improving plant resistance against pathogens by silencing genes that are essential for these pathogens...
October 17, 2016: Molecular Plant Pathology
Virginia Almadana Pacheco, Ana Paulina Gómez-Bastero Fernández, Agustín Valido Morales, Estefanía Luque Crespo, Soledad Monserrat, Teodoro Montemayor Rubio
: There is evidence of the relationship between mental illness and smoking and increased risk of depressive episodes after quitting smoking, even with specific treatments for abstinence. OBJECTIVE: To assess the influence of a cessation program on the emotional state of patients by measuring levels of anxiety / depression and differences depending on the presence of psychiatric history. METHOD: A prospective observational study of patients taking part in a combined program (pharmacological and cognitive-behavioral) for giving up smoking...
October 7, 2016: Adicciones
Pranil Man Singh Pradhan, Kedar Marahatta
Background. Adolescents frequently attempt smoking cessation but are unable to maintain long term abstinence because they are dependent on nicotine and experience withdrawal symptoms. Objectives. This study aimed to explore the quitting attempts among adolescent smokers in Dharan Municipality of Eastern Nepal. Methods. A cross-sectional study was conducted using pretested self-administered questionnaire adapted from Global Youth Tobacco Survey to assess current smokers and quitting attempts among 1312 adolescent students in middle (14-15 years) and late adolescence (16-19 years)...
2016: Journal of Addiction
B Dautzenberg, P Birkui
INTRODUCTION: The objective of this work was to assess the background of the implementation of the ban of tobacco sales to minors before the change of French law in 2016. METHODS: The analysis focused on two questions to teenagers on buying tobacco, added to the four cross-sectional annual surveys of the association "Paris Sans Tabac" from 2012 to 2015. RESULTS: In total, 7025 schoolchildren (12-15 years old), 3299 high school students (16-17 years old) and 3243 adult students (18-20 years old) responded...
October 13, 2016: Revue des Maladies Respiratoires
Ryan Mills, Steve Kisely, Rosa Alati, Lane Strathearn, Jake M Najman
AIMS: To investigate whether: (1) child maltreatment is associated with lifetime cannabis use, early onset cannabis use, daily cannabis use and DSM-IV cannabis abuse in young adulthood; and (2) behaviour problems, tobacco use and alcohol use at 14 are associated with cannabis use. DESIGN: Birth cohort using linked government agency child protection data to define exposure to child maltreatment. SETTING: The Mater-University of Queensland Study of Pregnancy in Brisbane, Australia...
October 14, 2016: Addiction
Josephine R Tarren, Selena E Bartlett
While the co-morbidity of alcohol (ethanol) and tobacco (nicotine) dependence is well described, the processes that underpin this strong connection are still under debate. With the increasing popularity of electronic cigarettes (e-cigarettes), it is now becoming more important to look to the neurobiological mechanisms involving alcohol and nicotine interactions to effectively treat a new generation of co-dependent individuals. Researchers have already recognized that the neuropathology produced by the combination of nicotine and ethanol is likely to produce an addictive nature very different to that of either one alone, and are employing a mixture of pre-clinical techniques to establish and investigate every stage in the development of both nicotine and ethanol-seeking behaviors...
October 14, 2016: American Journal of Drug and Alcohol Abuse
Young Dae Kim, Yo Han Jung, Gustavo Saposnik
Stroke is one of the leading causes of death and morbidity worldwide. The occurrence of stroke is strongly dependent on well-known vascular risk factors. After rapid modernization, urbanization, and mechanization, East Asian countries have experienced growth in their aged populations, as well as changes in lifestyle and diet. This phenomenon has increased the prevalence of vascular risk factors among Asian populations, which are susceptible to developing cardiovascular risk factors. However, differing patterns of stroke risk factor profiles have been noted in East Asian countries over the past decades...
September 2016: Journal of Stroke
Longyan Tian, Yonglin Wang, Jun Yu, Dianguang Xiong, Hengjun Zhao, Chengming Tian
Verticillium dahliae, a ubiquitous phytopathogenic fungus, forms resting structures, known as microsclerotia that play crucial roles in Verticillium wilt diseases. VdHog1, a mitogen-activated protein kinase (MAPK), controls microsclerotia formation, virulence, and stress response in V. dahliae. In this study, we present detailed evidence that the conserved upstream component of VdHog1, VdPbs2, is a key regulator of microsclerotia formation, oxidative stress and fungicide response and plant virulence in V. dahliae...
2016: Frontiers in Microbiology
Alexandra Pánková, Eva Králíková, Lenka Štěpánková, Kamila Zvolska, Zbyněk Bortlíček, Milan Bláha, Matthew M Clark, Darrell R Schroeder, Ivana T Croghan
BACKGROUND: Weight concerns are prevalent in smokers and may reduce the success rate of quitting. This concept has been primarily studied on USA populations and it is unknown how weight concerns may differ cross-culturally. This study examined the role of weight concern in European smokers wishing to stop smoking. METHODS: A sample of 593 smokers (299 men and 294 women, mean age 38 years) utilizing the Centre for Tobacco-Dependent in Prague, Czech Republic, between 2010 and 2013 were studied...
October 11, 2016: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
Sreekanth C Narayanapillai, Shang-Hsuan Lin, Pablo Leitzman, Pramod Upadhyaya, Carolyn J Baglole, Chengguo Xing
4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is a key carcinogen responsible for tobacco smoke-induced lung carcinogenesis. Among DNA damages caused by NNK and its metabolite 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), O6-methylguanine (O6-mG) is likely the most carcinogenic in A/J mice. Results of our previous studies showed that O6-mG and other NNAL-derived DNA damages were preferentially reduced in the lung of female A/J mice upon the dietary treatment with dihydromethysticin (DHM), a promising lung cancer chemopreventive agent from kava...
October 11, 2016: Chemical Research in Toxicology
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