Yes, you can donate blood if you smoke or consume cannabis. The recipient of the blood will not get high, another common MYTH. All donors go through the same health Smoking (or vaping) doesn't affect your ability to donate blood. Help us bust this myth by sharing our post. 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 Is Blood Donation Good for Health? Dr. Karuna Kumar