i saw a vid on youtube yesterday that said something like- Scientists have tried to do a study on the lethality of marijuana, so that if it should ever be deemed legal, strength could be regulated by the FDA. But the Scientists weren't able to complete their testing. Basically what they do is they take 52 labrats or other small animals, feed them a certain dose of a drug, and see how many of them die from that strength of the drug, so they can determine how lethal it is. The scientists were unable to complete the test, because none of the labrats died.
They concluded that in order for a being to overdose or die from marijuana ingestion, someone would have to ingest the equivalent to 1,500 times the amount of a regular marijuana ciggarrette in the period of 15 minutes (assuming that a joint weighed 1g i think it was). So basically what they are tryin to say is, in order for someone to overdose and die from pot ingestion, it would take 1,500 grams being smoked in a period of 15 minutes. Now THATS fuckin dedication , lol.
I would assume that someone would be more likely to smoke themselves sober before they would ever start to feel effects of some type of overdose from cannabis ingestion.
hope that helped a lil bit