Against this backdrop, the new study finds that mammalian cells contain their own nitrosonium ions, which directly react with nicotine to form nitrosamines, including NNK
This level of smoking often signals strong nicotine dependence, and its also a costly choice, considering the price of cigarettes in Canada

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Great for cigarettes, but can be used for all purposes
Bird et al., Interactions between Stimulants: Effects on DRL Performance and Lethality in Rats, Pharmacology, Biochemistry and Behavior, 1987;27:299306