Think you know it all about medical marijuana? You might be surprised to learn it’s already legal in 15 states. If you live in AK, CA, CO, HI, MI, MT, NV, NJ, NM, OR, RI, VT, VI, WA — with the proper permit, of course — you can smoke away what ails you. Find out five things you probably don’t know about the medicinal form of the herb after the jump. @capriSUNshine