For the first time ever, a solid majority of Americans supports legalizing marijuana for recreational use: 56%, according to the most recent Rasmussen poll. Support for legalization has been growing steadily since the 1990s; in 1994, just 25% were in favor. Culturally, marijuana's become hardly more than a punchline. But in reality, U.S. marijuana policy is no joke; it causes great harm, both directly and indirectly. Here are the 10 most important reasons our marijuana laws deserve serious reconsideration.