Weed And Donating Blood: All You Need To Know Moose Labs Smoking (or vaping) doesn't affect your ability to donate blood. Help us bust this myth by sharing our post. We all know smoking and vaping isn't great for your health. But it doesn't stop you from being a blood or plasma donor. Just make sure to wait one hour after donating Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Can You Donate Plasma If You Smoke Weed? https: www.greenreliefhealth.com