About half of marijuana users in states where it's legal say they've gone to work while under the influence of the drug ... Instamotor polled 600 self-identified marijuana users in states where recreational marijuana is legal ... Almost half -- 48 percent -- of respondents said they have gone to work high, with 39 percent stating that they go to work under the influence at least once per week. ... 50 percent said they would likely be fired if their boss knew they were high at work.