Can Marijuana Use Prevent You From Giving Blood? 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 Can you donate blood if you smoke? Does Vaping Cause Lung Cancer? INTEGRIS Health Is Vaping Better Than Smoking? American Heart Association