Can I Donate Blood? Common Blood Donation and Eligibility Questions Cannabis Use and Blood Donation: Unmasking the Truth 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? Cannabis, Nicotine, and More Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times