That’s the number of American people (12 years and older) estimated to have smoked pot in 2010.

The number of pot users increased by about 17 percent between 2007 and 2010, according to the latest National Survey on Drug Use and Health.

And apparently 215 and other such laws are driving the increase:

“Emerging research reveals potential links between state laws permitting access to smoked medical marijuana and higher rates of marijuana use,” said Gil Kerlikowske, Director of National Drug Control Policy.

You can wade through the whole report here.

The exception to this trend is that fewer people are doing meth. Significantly fewer. Meth users apparently decreased by almost half — from 731,000 people aged 12 and up in 2006 to 353,000 in 2010.