Simply put, a cookie is a very small text file placed on your hard drive by a Web Page server. It is essentially your identification card, and cannot be executed as code or deliver viruses. It is uniquely yours and can only be read by the server that gave it to you.
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Rates of drug dependence (the percentage of users who experience symptoms that reinforce their drug use and have trouble quitting) are higher for nicotine than for marijuana, cocaine, or alcohol. Source