Hello and thanks for writing. In short yes alcohol and marijuana is not good for your heart. You are already suffering from Coronary Artery Disease and have had the bypass and PTCA with stent. This makes your heart weaker than normal. The reserve in your heart is lower than that of a normal person. Occassional Alcohol causes fatty liver and deranged cholesterol levels which is detrimental to your coronary arteries. It also causes drug interactions and hence your cardiac medications might not effectively work even though you may be taking them regularly. Marijuana smoking increases your Heart Rate for few hours after smoking. THis increased heart rate further reduces the blood supply to your heart via the coronaries. It puts you at an increased risk of getting a heart attack. I can understand that stressful environment can lead to such behaviour. But I still advise your to quit them asap. To reduce your stress you can try meditation and other relaxation exercises. I suggest that you get in touch with your nearest GP and discuss with him the ways you can quit. Regards Dr Manish Jha