AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Nicotine patch on a woman's arm. The patch is applied to her arm as a method of giving up smoking. Nicotine is an addictive drug found in cigarettes. The nicotine in the patch is released in small measured doses into the bloodstream through the skin (transdermally). A course of patches slowly decreases the amount of nicotine delivered, easing the withdrawal symptoms felt by smokers who are trying to quit.
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