These usage patterns are similar to what's seen among tobacco users. "What’s going on here is that over the last 20 years marijuana went from being used like alcohol to being used more like tobacco, in the sense of lots of people using it every day," Caulkins said in an email. Adults with less than a high school education accounted for 19 percent of all marijuana use in 2012 and 2013 (compared to 13 percent of the total adult population), according to the survey. This is similar to their 20 percent share of all cigarette use, but considerably higher than their 8 percent share of all alcohol use.
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