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Maybe it’s because I was born a couple of months after Woodstock and wasn’t around when marijuana was as common as iPods are today, but I’m constantly amazed that after all these years–and all the wars on drugs and all the public-service announcements–nearly 15 million Americans still use marijuana at least once a month. California and 10 other states have already decriminalized marijuana for medical use. Now two of those states–Colorado and Nevada–are considering ballot initiatives that would legalize up to an ounce of pot for personal use by people 21 and older, whether or not there is a medical need.