Grim Reefer

Marty, a down on his luck, Native American 20-something, is coerced by his scumbag second cousin Grant to be his wheelman for a "simple robbery." When things get violently out of hand, Marty makes his escape while Grant is killed in a hail of gunfire after a bloody stand-off with the cops. Months later, when a crop of marijuana is grown on the spot where Grant died, his spirit is tied to this haunted hashish. Now, when anyone smokes it they get possessed by his ghost and he uses their body to continue his kill-crazy rampage...all while being really, really baked.