Linked from
The 8 pages that link to Nicotine dependence, each with the reason it gives.
Tobacco smokingRelated: Repeated nicotine exposure can make smoking difficult to quit.
BupropionRelated: Bupropion supports cessation despite not being a nicotine replacement product.
Electronic cigaretteRelated: Nicotine-containing devices can sustain or create dependence.
Tobacco smokeRelated: Nicotine delivered in smoke reinforces repeated tobacco use.