US "war on drugs" unconstitutional?

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I've decided recently that I believe the US "war on drugs" is illegal and unconstitutional. It is not up to the US government to decide what their citizens consume. At the very most it is a state issue, not a national issue. Consuming recreational drugs should be legal. Not only has this prohibition broken our rights as citizens, but it has made recreational drugs a dangerous and popular market. Much like how the alcohol prohibition of the 1920's actually increased crime. If recreational drugs were legal they would likely be used less, and they could be regulated to make them safer to consume (like making sure they aren't cut with arsenic). The gangs, crime, and violence surrounding illegal drugs would not exist if it were legal. All in all the war on drugs has made drugs more popular and more dangerous at the same time. I'd like to note that I do not encourage drug use as it is a dangerous practice, I just believe it should be legal. What are your views on it? Feel free to expand upon the topic and include the legality of various other drugs today (alcohol, nicotine, caffiene) Dan