According to a survey conducted by Gallop, up to 38 percent of people in the United States have tried marijuana at least once in their lifetime as of 2013.
The number of respondents who claimed to have tried marijuana was up slightly from the 33 percent rate in 1985 and the 34 percent rate in 1999.
In 2013, the number of people who tried marijuana in the 18 to 29 age bracket was 36 percent. In the 30 to 49 age bracket, the rate was 49 percent. 44 percent of adults aged 50 to 64 used marijuana, and 17 percent of those over 65 used it at least once in their lifetime.
Source: Lydia Saad, “In U.S., 38% Have Tried Marijuana, Little Changed Since ’80s,” Gallop, August 2, 2013.