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Cotinine is metabolite of nicotine, the addictive substance found in tobacco and smoking-cessation products
References: The Health Consequences of Smoking50 Years of Progress: A Report of the Surgeon General.National Center for Chronic Disease Prevention and Health Promotion (US) Office on Smoking and Health.Atlanta (GA): Centers for Disease Control and Prevention (US)
Halpern-Felsher: Given that adolescents overestimated the extent to which their peers use marijuana, and that having friends who use marijuana was significantly related to the adolescents' own use, dispelling misperceptions about peer use might be effective
[4] It can still have health consequences even after long use, so it would be good to treat it as a temporary means and not as a permanent solution
How many puffs in a cigarette compared to