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New technology invariably comes with risks and unknowns, and vaping technology is no different

Clinton traded quips with Carson and played "Summertime" on the saxophone in what was hailed as a stunning comeback

The Composition of Cigarette Smoke Cigarette smoke is a complex mixture of over 7,000 chemicals, including numerous toxic substances

Cross sectional studies show that, on average, smokers weigh less than non-smokers, and former smokers weigh more than both smokers and non-smokers.1 A large prospective study has shown that adolescents who initiate smoking gain less weight than their non-smoking peers.2 Cohort studies also show that people who stop smoking gain weight.1 3 4 5 6 7 8 Smoking cessation probably causes weight gain because nicotine (in cigarettes) is an appetite suppressant.3 One of the most common and longlasting symptoms of tobacco withdrawal is increased appetite.9 Furthermore, evidence suggests that nicotine increases the basal metabolic rate, and removal of this effect results in a decline in energy expenditure at a time when appetite is increased.3 Estimates of the amount of weight that smokers gain when quitting have varied

Cannabis and vasoconstriction Cannabis has long been thought to cause vasoconstriction, in which the walls of a blood vessel (particularly the arteries and arterioles) contract, narrowing the channel and restricting blood flow along it