Who Are You? US Government Statistics on Adult Marijuana Users

[UPDATE: The portion of my post relating to race and ethnicity data was missing one of the pie charts.  The text has been changed to reflect the correct data from the missing chart.  My apologies for any confusion. -- Russ Belville]

The US Government’s Substance Abuse and Mental Health Data Archive (SAMHDA) is a treasure trove of information from the National Surveys on Drug Use & Health 2001-2007. I’ve always been uncomfortable discussing most marijuana statistics from this and other reports because the data so often cover marijuana use from age 12 and older. NORML stands for the responsible adult use of marijuana, so I wanted to know the facts on age 18 and older (some may wish for numbers age 21 and older; I only picked 18+ because the first data column is age 18-25).

The essential caveat: these are the people who will tell these things to a stranger for a government survey.

First of all, how many adults in the United States have ever smoked weed? The Survey breaks down the data by age categories and gives the percentage of the sample (Unweighted N) that answered yes or no to the question. Then they extrapolate, based on US adult population demographics, how many people in the United States (Weighted N) would answer yes or no.

US Adults Who Have Ever Used Marijuana by Age

That’s 95 million folks who’ve smoked herb.  The percentage is how many within that age group have used – a majority of 18-25s and 35-49s and real close on the 26-34s.  Or look at it this way: If you see someone under age fifty, flip a coin. Heads, they’ve smoked pot, tails, they haven’t.

When you look at the population of adults who have ever used marijuana, we find that young people (18-34) and middle-aged people (35-50) are equally represented at 36% of the population.

More fun with government numbers and Excel 2007 after the break…

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