its not that bad for them unless its fuckin mega boxed, but i know a older guy whos been growin for years and years and years and he let me smoke joints in his grow room he said aslong as it aint cigs its all good not wanna give his plants leaf cancer and shit hahaha
well he didnt say that but he said weed smoke doesn't matter, plants are air filters, i box my room and a hour later its all clean, i suspect my girls have something to do with it.