Background: Cigarette smoking has several known detrimental effect on cardiovascular system.  QT dispersion (QTd) is among the important predictors of cardiac death. Objective:  To assess the acute effect of smoking of a single standard cigarette on QT and QTc (corrected QT) dispersion, hence on the risk of ventricular arrhythmias in healthy smokers and non-smokers. Methods: 111 healthy men wit...

Introduction: Tobacco smoke is involved in the pathogenesis of several diseases in different body systems. Saliva is the first body fluid that confront inhaled cigarette smoke which is injurious to the oral cavity and is associated with several oral diseases and cancer. The aim of our study was to evaluate the influence of smoking on the activity of alpha-amylase in the saliva of healthy smoker...

background: cigarette smoking is one of the most important health‑related risk factors in terms of morbidity and mortality. in this study, we introduced a new method for deriving the transitional probabilities of smoking stages from a cross‑sectional study and simulated a long‑term smoking behavior for adolescents. methods: in this study in 2010, a total of 4853 high school students were random...

objective: cigarette smoking is a highly addictive behavior and nicotine dependence is a well known model for drug dependence. it also acts as a gateway drug for the use of other illicit substances. in 1999, iran ministry of health and the national research center carried out a study which revealed that 11.9% of iranian population use cigarette. methods: the present study is a cross-sectional h...

objective: smoking is a worldwide health problem. despite recent efforts to reduce the rate of smoking, adolescent smoking still remains a significant public health concern. current study was conducted to determine the effects of socio-environmental and personal factors on the smoking among adolescents. method: in the first stage of a longitudinal study of smoking in adolescents, 1785 students ...

Objective(s):One cause of cigarette smoking is oxidative stress that may alter the cellular antioxidant defense system, induce apoptosis in lung tissue, inflammation and damage in liver, lung, and kidney. It has been shown that Chinese green tea (CGT) (Lung Chen Tea) has higher antioxidant property than black tea. In this paper, we will explore the preventive effect of CGT on cigarette smoke-in...

Background: Tobacco and hookah smoking is a worldwide problem among adolescents. The present study aimed to determine familial and social factors in predicting the tobacco and hookah smoking among high school students in Jahrom, South of Iran. Materials and Methods: This cross-sectional study was conducted for assessing the factors affecting hookah and cigarette smoking among high school stude...

Background. The purpose of this study was to evaluate the association between receptivity to cigarette promotions and smoking uptake in a cohort of adolescents. Methods and Measures. This was a prospective cohort study of 480 4thto 11th-grade students conducted in three rural Vermont K–12 schools. Cigarette use was determined by self-report at baseline, 12 months (survey 2), and 21 months (surv...