Hi there ~ I understand your concerns. Using THC in any way is harmful. It is especially so if you have had a surgery on your heart. I believe that there is a risk and the risk can only be explained after the event has occurred. I believe that using THC can be worse when taken with alcohol and there are no comparisons to using THC and alcohol. I advise you to avoid both these drugs and use medical treatment for withdrawal symptoms. A consultation with a psychiatrist who is a specialist in substance use disorders treatment would be appropriate. I hope this helps. Take care and have a lovely day!