The LD50 for THC is an insanely inconcievable amount. The example I was given is that to OD on weed you'd have to smoke 3000 times the normal amount. I usually smoke about a gram to get decently baked. I wouldnt even be awake after more than 7, and I definately couldn't fathom the idea of smoking 6.5lbs, but you better believe I'd try.