Linked from
The 18 pages that link to Nicotine, each with the reason it gives.
Tobacco smokingRelated: Inhaled nicotine rapidly reaches the brain and reinforces repeated smoking.
SolanaceaeRelated: It is a characteristic defensive chemical of Nicotiana species.
Electronic cigaretteRelated: It is a common e-liquid ingredient and drives dependence.
Tobacco smokeRelated: It occurs in smoke and drives much of tobacco's dependence-forming effect.
VareniclineRelated: Varenicline competes with nicotine at receptors involved in dependence.
CigaretteRelated: Burning tobacco releases nicotine, which helps sustain cigarette dependence.
NicotianaRelated: Several Nicotiana species produce this potent defense chemical in their tissues.
Passive smokingRelated: Its presence in smoke makes it a marker of tobacco exposure.