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Addiction is a obsession of physical dependence on anything. It does not just apply to drug usage. It can apply to shopping, money, food, or even video games.
http://answers.ask.com/Health/Addictions/what_is_a...
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Alcohol is addictive to many people but for a number of reasons. Personality, the brain and genetics are involved in how much a person drinks and how often. Look here for more information
http://answers.ask.com/Health/Addictions/what_make...
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Nicotine is addictive because it is a chemical. That chemical causes many changes to the brain. The chemical then causes your brain to want more and more of the drug.
http://answers.ask.com/Health/Addictions/what_make...
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The marijuana may not itself be addictive, but people get addicted to the feeling of being high, which is what can cause marijuan to be addictive. Everyone is different so some people
http://answers.ask.com/Health/Addictions/what_make...
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