In U.S., 13% of Adults Say They Smoke Marijuana August 8, 2016 · Leave a Comment Thirteen percent of U.S. adults tell Gallup they currently smoke marijuana, nearly double the percentage who reported smoking marijuana only three years ago. CONT. Justin McCarthy, Gallup Share:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to email a link to a friend (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)MoreClick to print (Opens in new window)