I have an eccentric aortic valve and a leak in my aorta and pulmonary. i had open heart surgery 15 years ago. can i smoke marijuana safely?

No: No one can. You can smoke it for recreation; you can smoke it for pain control; you can smoke it because you think it's cool; you can smoke it for whatever current rationalization or ideology suits you. But you cannot smoke safely.

Can be bad for you: Marijuana smoke has been shown in studies to increase risk of heart disease, lung disease, and cancer.