What class drugs is nicotine?

Nicotine is not a scheduled drug as THC or LSD are for that matter. If you mean the effects of the drugs it is usually described as :

• Stimulant

• Depressant

Mostly Nicotine is recognized as a Stimulant but other properties have been reported by users. Nicotine also has therapeutic use in Schizophrenia, Ulcerative Colitis, Alzheimer's, and other mental diseases.

Nicotine is an alkaloid usually found in Tobacco ( it can be in Tomatoes, Potatoes also but in small amounts ) and belongs to the Nightshade Family.