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Drugs are harmful because they affect your body in negative ways. Any type of drug that makes you 'feel' good is actually killing brain cells which tell you that you are feeling good
http://answers.ask.com/Health/Addictions/why_are_d...
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Happiness!
http://wiki.answers.com/Q/What_is_the_most_non_har...
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According to my lifespan development book, its tobacco. (most harmful to a fetus)
http://wiki.answers.com/Q/What_is_the_most_harmful...
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Alcohol has resulted in more death, injury and destruction than many others around the world.
http://wiki.answers.com/Q/What_is_the_most_harmful...
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