Exactly. I am a newbie so I don't know much about growing (yet), but I do know alot about napthalene, aka 'mothballs'. The name comes, of course, from using preparations of the chemical to kill the larva of moths, back when moths laid eggs on wool garments and the larva fed on the wool-- a natural substance, after all-- before pupating into moths. Napthalene vapors will make your pot smell nasty, but worse than that, it is carcinogenic (cancer-causing) if a person is exposed to enough of it. Even without the cancer issue, napthalene damages the liver, red blood cells, and probably the brain.
Sorry, but I wouldn't smoke anything that has been too close to that stuff for very long. I do use it to keep mice out of my Nissan Z in the winter months, but I drive with the windows open for the first couple weeks each year!