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We use nicotine because it is the best indicator that smoking has taken place, but also, the nicotine in the environmental smoke starts to oxidize when it comes into contact with the oxygen in the environment, becoming part of the specific nitrosamines of tobacco, which are the carcinogens that are produced when the tobacco in the cigarette burns and when the nicotine oxidizes, explains the ICO researcher

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Now along come e-cigarettes to rattle that rationale

This isnt a placebo nicotine directly stimulates the central nervous system, activating a cascade of neurotransmitters like dopamine and norepinephrine