You sound like an intelligent person, so I suspect you already have some idea of what the answers are likely to be.
If there is a family history already, the throw of the dice is not good from the get-go. Anything you want u can do to decrease your risks may give you a longer, more disability-free life.
Any time there are kinks or twists in a hose (aorta), the risks increase for damage to the blood vessel walls--as well as to the blood cells--due to turbulence and pressure.
If you smoke, your BP is increased, period. If you smoke, damage to the blood vessel walls is increased. If you smoke, repair to damaged tissues (heart, bone, lungs, etc) is only possible during the hours you do NOT smoke.
How does bedridden with an oxygen tank sound to you?
Some of the things that have happened are still reversible. Change your ways.
A lot of people have leaky valves. The question is: how much do they leak.
Leakage is classified into different categories and if the leaking is "trace" or "mild", there is not much to worry about.
As far as I know there is no connection between the leakage of your valves and the smoking.
Also there is no connection between the leakage and coronary heart disease.
There is definitely a connection between coronary heart disease and smoking, so you are right, smoking is not good for you (r heart).