I found this on the internet in some federal court documents...

8. At present it is estimated that cannabis'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 time as much cannabis as is contained in one marijuana cigarette. NIDA-supplied marijuana cigarettes weigh approxi-mately .9 grams. A smoker would theoretically have to consume nearly 1,500 pounds of cannabis within about 15 minutes to induce a lethal response.
Garden Knowm Reviewed by Garden Knowm on . WARNING don't smoke 1500 pounds in 15 minutes - you could die!!! I found this on the internet in some federal court documents... 8. At present it is estimated that cannabis'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 time as much cannabis as is contained in one marijuana cigarette. NIDA-supplied marijuana cigarettes weigh approxi-mately .9 grams. A smoker would theoretically have to consume nearly 1,500 pounds of cannabis within about 15 Rating: 5