stuff that looks like weed in ways but isn't is called rabbit tobacco...it's wild, it can even smell like pot when it burns (despite the fact that it's just leaves)...i guess rabbits eat it for some reason because of the name...and it can buzz you, but it's nothing like marijuana...it's just a bunch of chemicals, oxygen and co2 reserves, etc. that you feel from it if you smoke it...it's in all woody areas of the eastern US....but i don't know about other places...this is just country knowledge too, nothing scientific, i couldn't give you a name of a specific plant, there's a few of them that resemble marijuana...but they look thin and shitty and just leaves, usually in sets of 1 or 3, unlike the 7 or 9 of mj...