Secondhand Marijuana Smoke?

man holding smoking vape pen(NIDA Blog Team, October 13) People often worry how breathing someone else’s marijuana smoke could affect them. Let’s look at some common questions about this, and the answers that science has found.

Can you get a “contact high” from secondhand marijuana smoke? It depends.

You’d have to be in an unventilated room, and very close to someone who is smoking for a long period of time. (“Unventilated” means all windows and doors are closed.)

In one study, 12 participants sat together for an hour in an unventilated room. Six participants smoked marijuana casually during that hour and the other six didn’t smoke anything. Read more.