Cannabis Use and Blood Donation: Unmasking the Truth Can You Give Blood If You Smoke? MD Spiro Think you can't donate blood? Think again. Australian Red Cross Lifeblood 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 Dos and Don'ts After Donating Blood SLMA Can You Donate Plasma If You Smoke Weed? My Marijuana Cards