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 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 Marijuana Use Prevent You From Giving Blood? Are vape pens, or e cigarettes, ever the better option? Ohio State Health & Discovery