Can I Donate Blood? Common Blood Donation and Eligibility Questions Did you know: You CAN donate blood if you use cannabis. If you have any questions about blood donation, please ask us! #DidYouKnowAboutBloodDonation Smoking and High Blood Pressure: The Dangerous Link Driving After Taking Any Form of Marijuana Is Unsafe Smoking (or vaping) doesn't affect your ability to donate blood. Help us bust this myth by sharing our post. What Lifestyle Habits Disqualify You From Donating Blood? SJMC