^^^Destiny has a good point.
If you cruise around the grow forums at sites that encourage/support cashcropping discussions, you will see an OUTRAGEOUS number of posts asking how to find Floramite, Avid, and Physan... None of which are approved for food crops nearing harvest!!!! I'll bet if we ever DO see a link between chronic cannabis use and lung cancer, it's going to be linked to the fucking SHIT that's getting sprayed on it so that the mites won't munch through its bag appeal...
This is what cashcroppers and even a lot of people who are growing for dispensaries are using! So definitely look into organically grown weed if you are sensitive to chemicals.

And for us growers, don't use any of that shit on your plants past the end of week 2 of flower, or no less than SIX WEEKS from harvest.