Walk down the streets almost anywhere in the District, and you won’t have to go far before you catch a whiff of a certain well-liked herb. Even before D.C.’s medical-marijuana law allows prescription pot, the scent of cannabis often drifts out of cars, hovers around the front of bars or wafts along sidewalks.

A federal study estimates 78,000 people in D.C. used pot in 2007, the last year for which statistics were available. That’s about 13 percent of the population at large; meanwhile, more than a quarter of 18-to-25-year-olds said they’d smoked in the last month alone.

washingtoncitypaper.com