Dilated right ventricle

A year ago i was told, after an echocardio exam, that i had a slightly dilated right ventricle and that my tricuspid valve did not close perfectly although there was no regurgitation. I also had an ECG while doing exercise which proved to be good and the functioning of the heart is fine and the dimentions of the 'walls' are normal. I am 26 years old and have always been into sports and in good shape but have (until a year ago) also been a heavy drinker and smoker. I am slightly concerned as i was told that the cause of the dilatation was not clear although the cardiologist said it was nothing to worry about. I also read that some forms of alcohol related heart dilation are reversible. I have no noticable symptoms and my resistance when doing sports has always been good. Does this condition carry any risks and can it get back to normal seeing as i'm quite young? I haven't had another echo since but from listening to it my doctor recently told me that my heart 'sounds' fine.