Stoner films—usually comedies—have become their own sub-genre in the decade since the hippies brought the herb into public consciousness. While many play off the silly side effects of the substance, there are a number of films that stand up on their own as actual works of art. Whether it’s the works of Cheech and Chong, the poster boys for marijuana or Easy Rider, which has serious undercurrents about the 60s druggy culture, here’s a guide to the best of the crop.