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are cigarettes safe Cigarette Smoking | Smoking and Tobacco Use E-cigarettes contain hazardous substances, addictive
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Because of its psychotropic nature, marijuana use has been controversial due to potential health risks such as impaired learning and coordination, anxiety, and addiction
Serum cotinine is considered a reliable marker of both smoking intensity and exposure to tobacco smoke

J Pharmacol Exp Ther 238 : 486491
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