Hello Doctor, i was just prescribed Harvoni for treatment of Hep C (low viral load) & no liver scarring. I am 60 years old, don't use any drugs except the prescriptions for diabetes & high blood pressure, no drinking or smoking of cigarettes, however i occasionally smoke marijuana to alleviate side effects. It also is very effective with blood pressure control. My question is does this hamper the effectiveness of Harvoni? Thank you very much....Don