Kevin Durant is still wearing a boot on his right foot. So it probably still hurts. So he probably needs something to take the pain away. So he probably smokes weed.
A routine TMZ video, in which they asked Durant the juvenile question of whether or not he would join the Lakers (like he's gonna drop a bomb like that outside a club at 2 am?), ended with one of the more awesome sports "oops" in recent memory. It appears Durant drops a vial of marijuana when he opens his car door.
The league doesn't test players for marijuana use during the off-season.