Hey there! So I had my bypass years ago in 2003 and I smoked weed pretty soon after and had no issue! I did however end up starting to use harder stuff about a year or so after and I almost lost my life due to it, on several occasions. Please be careful! Remember once it's in you can't turn back! My struggle with with Coke and it ate away my insides to the point that I have had over 20 surgeries and now eat through a tube! I still smoke weed to help me eat some normal food and because I have severe ptsd from it all. Have fun but be careful on what you choose to use!