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 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