 In addition to nicotine, tobacco smoke contains small amounts of the alkaloids anatabine, anabasine, nornicotine, N-methylanabasine, anabaseine, nicotine N'-oxide, myosmine, β-nicotyrine, cotinine, and 2,3'-bipyridyl.The nicotine molecule contains two nitrogen atoms with basic properties.The nicotine molecule can thus add one proton to form a monoprotonated species or two protons to form the diprotonated species.