Nicotine

A chemical found in tobacco, aubergines and tomatoes which is considered one of the most addictive drugs in existence. It is a mild stimulant, with stress relieving effects. It is widely used in the form of cigarettes, the use of which carries a high risk of causing cancer or heart issues over time. Increasingly, it is 'vaped' as a purportedly safer alternative to smoking.

Source: TripSit — Nicotine ↗