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The simple answer is yes; cannabis users, even daily users with extreme exposure to THC, are eligible to donate blood. In fact, the American Red Cross has an entire page dedicated to answering your questions about donating blood and cannabis use.
According to the American Red Cross, “The use of cannabis does not disqualify an individual from blood donation, but potential donors cannot give if their use of cannabis impairs their memory or comprehension.”
Similarly, it notes, “There is no data that specifies how long an individual should wait between cannabis use and blood donation,” but the foundation stresses that you will not be eligible to donate blood if cannabis use impacts memory and comprehension.
Finally, blood banks will not test for THC levels, and the individual who receives your blood will not be at risk of failing a drug test due to THC’s presence in your body at the time of donation.
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Although THC will not keep you from donating blood, there are plenty of factors that will. The following are a few general disqualifiers from blood donation;
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