Cigarettes and some other products containing tobacco are highly engineered so as to create and maintain dependence to nicotine. It is not nicotine itself which is the most dangerous agent of smoking, but the many compounds that these products contain and the smoke they produce that cause most of the damage: they are pharmacologically active, toxic, mutagenic and carcinogenic.
See link in post # 2.
And thanks mcclure8
See link in post # 2.
And thanks mcclure8
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