be more subtle. "Smoking and carcinoma of the lung; preliminary report". Leistikow BN, Martin DC, Samuels SJ (Dec 2000). That said, this is a fast-growing area of research, and clues are beginning to emerge. "Health : Young smokers' heart attack risk". Citation needed Users of dipping tobacco are believed to face less risk of some cancers than smokers but are still at greater risk than people who do not use any tobacco products.
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The acrolein-guanine adduct induces mutations during DNA copying and thus causes cancers in a manner similar to PAHs. Allam MF, Campbell MJ, Del Castillo AS, Fernndez-Crehuet Navajas R (2004). A year after quitting, the risk of contracting heart disease is half that of a continuing smoker. This suggests nicotine use has a pleasurable effect that triggers positive reinforcement. We cannot guarantee results and occasional interruptions in updating may occur. "Little cigars, big cigars: omissions and commissions of harm and harm reduction information realism of Mark Twains Writings on the Internet".
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