I spoke with an Organic Chemistry major. He smokes weed, and is AWESOME. Read this.

[LiquidMagik]

Awesome post.

Scientists usually call this the "half-value" (or something like this), where they determine half of the dose of a chemical it takes to produce a lethal effect). I hear the rate of consumption of the highest grade marijuana has is 1.5g every second for fifteen minutes.

What you're referring to is the LD-50, or lethal dose in 50% of the sample (not the half of the lethal dose). I don't think the value has been calculated for smoked cannabis, but for eaten cannabis at 5% THC (this is pretty low grade stuff), it's around 2-5 lbs for a 150 lb person. So, virtually impossible.