Can you donate blood if you smoke? Can you smoke when Can You Donate Blood if You Smoke Weed? Mango Cannabis Can You Donate Plasma If You Smoke Weed? https: www.greenreliefhealth.com CBD Cannabis and voluntary blood donations: what is the rule? Justbob 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