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. Author manuscript; available in PMC: 2016 Apr 11.
Published in final edited form as: N Engl J Med. 2014 Jun 5;370(23):2219–2227. doi: 10.1056/NEJMra1402309

Figure 2. Use of Marijuana in Relation to Perceived Risk and Daily Use of Tobacco Cigarettes or Marijuana among U.S. Students in Grade 12, 1975–2013.

Figure 2

Panel A shows the inverse correlation between the perception of the risk associated with marijuana use and actual use. Perceived risk corresponds to the percentage of teenagers who reported that the use of marijuana is dangerous. Panel B shows the percentage of students who reported daily use of tobacco cigarettes or marijuana in the previous 30 days. Data for both graphs are from Johnston et al.26