Other factors that may disqualify a person from giving blood include: feeling sick or having cold or flu symptoms using intravenous drugs not prescribed by a licensed doctor having an active infection having HIV or testing positive for hepatitis B or C having uncontrolled diabetes having a blood clotting disorder having ever had the Ebola virus having blood cancers, such as leukemia or lymphoma having received a blood transfusion within the past 12 months having a heart rate below 50 beats per minute (BPM) or above 100 BPM having recently traveled to a foreign country being pregnant, or having given birth within the past 6 weeks Although smoking cigarettes, vaping, and using cannabis will not disqualify a person from donating blood, they should refrain from smoking for at least A person may feel lightheaded or weak after giving blood, and smoking can exacerbate these symptoms

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