Nicotine

How it works:
Alters availability of chemical involved in feelings of reward and wellbeing.
Stimulates cardiovascular system.

How it feels:
Simultaneously arouses and relaxes.
Induces sense of well-being and calm.

How it hurts:
Some say not addictive; others say smokers feel increased craving for cigarettes.
Resulting in emphysema, lung cancer, heart disease.

How to get help:
American Cancer Society, 1- 800-227-2345.