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The signs of nicotine addiction are strong cravings for tobacco products or nicotine, tolerance requiring more nicotine to achieve the same effect, irritability or anxiety when unable to access nicotine, difficulty quitting or unsuccessful attempts to stop using tobacco, increased use of nicotine over time, withdrawal symptoms such as headaches, fatigue, or mood swings, and continued use despite health problems related to smoking or nicotine use

Henningfield JE, Fant RV, Tomar SL

For example, your doctor might prescribe buproprion (Zyban)

All of the other positions were less so

How Does Chewing Tobacco Affect Your Lungs