ok so heres my say on the smoking near cannabis..

1. cigarrettes are bad for you, for when the tobacco and its additives is burn and inhaled, its carcinogens are damaging to our cells.. plants breath just as we do, so i would assume that such a basic rule would apply for the plants

2. adaptation and evolution has definitly taken cannabis very far (u knw what im talkin bout fellas :stoned but as well as its marvelous flowers (:stoned cannabis has adapted over its species life span to be a very sturdy and strong plant. i would assume that cannabis has definitly come into conctact with smoke of one of its counterparts during a fire and such, and by the rules of survival of the fittest, perhaps those who were most resistant to the smokewere the ones who were able to reproduce and continue the species. just a wild thought there

3. ive personally seen an instance where a smoker used his growroom frequently for a smoke of the good shit and never really saw anything particularly alarming about his grows

4. weed really isnt harmful for is users (not noticeably anyways) so perhaps wouldnt be harmful for weed to use it either.. just dont smoke around ur plants too much, they might get peer pressured, loose all motivation and ambition, and get lazy as fuck during the last few weeks of flowering.. tsk tsk

5. im high.. my appologies