Medically reviewed by Kashif J. Piracha, MD Key Takeaways You can get addicted to nicotine within days of starting to use it. Nicotine affects the brain by releasing dopamine, which makes you feel ...

Nicotine has a half-life of about two hours and can stay in the blood for about one to three days. Cotinine, a byproduct of nicotine, has a half-life of 18 hours and can last for several days.

Have you tried to quit an addictive substance, such as alcohol, nicotine or other drugs? Were you surprised at how long the challenge lasted? “Just get through the withdrawal,” your therapist or ...

It’s a number to celebrate: 3.9 million. That’s the likely number of Americans saved from lung cancer since 1970 with efforts ...