Nicotine is a highly addictive stimulant found in tobacco. This drug is quickly absorbed into the bloodstream when smoked.
How it’s used: Nicotine is typically smoked in cigarettes or cigars.
Some people put a pinch of tobacco (called chewing or smokeless tobacco) into their
mouths and absorb nicotine through the lining of their mouths.
Effects & Dangers:
Addictiveness: Nicotine is as addictive as heroin or cocaine, which makes it extremely difficult to quit. Those who start smoking before the age of 21 have the hardest time breaking the habit.