Nicotine, a prescribable drug available without prescription.
D002638:Chewing Gum / Q000032:analysis; D006801:Humans; D009538:Nicotine / Q000032:analysis / Q000506:poisoning*; D010947:Plants, Toxic; D014026:Nicotiana / Q000032:analysis; D014030:Tobacco, Smokeless / Q000032:analysis
D002638:Chewing Gum; D009538:Nicotine