Nicotine is a stimulant found in the leaves of the nightshade family of plants.
Nicotine is highly addictive. It passes through the lungs and binds to receptors in the brain.
Here is how nicotine amounts compare:
Cigarette: 1 -14 mg per cigarette
Cigar: 100-200 mg per cigar
Smokeless tobacco (chew or snuff): 4-16 mg per use
Electronic cigarette (e-cigarette vaping): 9-16 mg per 1 ml dose (this varies widely)
Hookah: 12.5 mg per bowl
In products used to treat nicotine addiction:
Nicotine Patch : 15-21 mg/24 hour patch
Nicotine gum: 2 mg per piece