Can You Donate Blood if You Smoke Weed? Mango Cannabis Can Vaping Cause Lung Cancer? Here's What We Know. 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 you donate blood if you smoke? Is Vaping Better Than Smoking? American Heart Association