Can You Give Blood If You Smoke Weed? Explained Clearly Smoking (or vaping) doesn't affect your ability to donate blood. Help us bust this myth by sharing our post. Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Severe bleeding linked to synthetic cannabinoid use Texas Poison Center Network 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 Can You Donate Blood if You Smoke Weed? Mango Cannabis