JOSH SHER / SCIENCE PHOTO LIBRARY JOSH SHER / SCIENCE PHOTO LIBRARY
Nicotine gum. This Nicorette chewing gum contains the chemical nicotine, which is used to help people stop smoking. It contains less nicotine than cigarettes and acts to satisfy the smoker's nicotine craving. The drug is also free from the cancer-causing chemicals found in cigarette smoke.
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