Since marijuana usage is so prevalent in society why Isn't It legal?

Prevalent, in that a large number of people smoke it with and without negative effects. As with alcohol consumption, some people have a problem and some people don't. Also, it's use is seen as acceptable entertainment in films and on TV, eg Cheech and Chong movies, Harold and Kumar movies, the British show Ideal... show more Prevalent, in that a large number of people smoke it with and without negative effects. As with alcohol consumption, some people have a problem and some people don't.
Also, it's use is seen as acceptable entertainment in films and on TV, eg Cheech and Chong movies, Harold and Kumar movies, the British show Ideal (which is shown on Australian government TV) and is all about a dealer and his friends. To me this is a double standard, especially considering there are laws on the books that implicitly state that it is illegal to inform the public on methods of drug administration.
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