For THC, there are varying figures, ranging from 1,260 milligrams of THC per kilogram of body weight down to 666 mg/kg. Even going with the lowest figure, a 175-pound man would have to consume more than 53 whole grams of pure THC all at once. And pure THC isn't something you are going to find in even the purest shatter oils and waxes produced. If we're talking commercially produced edibles, then you would probably die from an overdose of salt (3,000 mg/kg) or sugar (1,100 mg/kg) before even coming close to the threshold for marijuana.