The toxicity level for THC has never been found, but the closest estimate i know is you'd have to smoke 1500 lbs of high grade skunk within 15 minutes. As im sure everyone is aware, its imposssible. If someone died from doing this it'd have nothing to do with the THC, it'd simply be from suffocation.

Meaning: You cannot overdose on THC, no matter how much you take. It's one of the safest things humans can take. Even water has a toxicity level, but not THC.

" At present it is estimated that marijuana's LD-50 is around 1:20,000 or 1:40,000. In layman terms this means that in order to induce death a marijuana smoker would have to consume 20,000 to 40,000 times as much marijuana as is contained in one marijuana cigarette. NIDA-supplied marijuana cigarettes weigh approximately .9 grams. A smoker would theoretically have to consume nearly 1,500 pounds of marijuana within about fifteen minutes to induce a lethal response."

Check out the link in my sig for more details.