Quote Originally Posted by Beeblebrox.420
Not even close. According to various sources, the number of Americans who regularly smoke marijuana varies between about 15 and 20 million, mostly depending on the definition of "regular user". Given that the current US population is about 270 million, this works out to between 5.5 to 7.4 percent of the total population who are regular users. Obtaining worldwide figures is more problematic, but I can see no reason why we cannot extrapolate the US figure to a good first-order approximation. I don't know what the percentage of regular heroin users is, but no doubt you are correct that it is considerably lower than the figure for marijuana use.
I think those numbers were meant to be % who have tried either drug. Though they were still probobly estimations. The point being that a significant portion of at least the U.S. population has tried marijuana with no fatalities.