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 Does cannabis create thirdhand smoke? Thirdhand Smoke Resource Center Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Can You Give Blood If You Smoke Weed? Explained Clearly Severe bleeding linked to synthetic cannabinoid use Texas Poison Center Network