I'm not a health professional but have read a lot of reports from my own stress tests, and it sounds like you have a strong heart. An ejection fractions of 70% is something those of us with heart problems would embrace. However, you were given a big warning. Your family history suggests heart problems will visit you, especially because you smoke and are considered obese. I'ts not easy to quit, I know, but certainly it's possible. Losing weight is tough, also.