No one can say: "I lead a happy life" or "I lead an unhappy life". We experience both happy and unhappy moments throughout our lives. Our personal efforts should be focused on creating as many happy moments as possible. But you can't completely avoid unhappy moments. So there can't be one "happy life". There can only be many happy moments throughout life. The same applies to a healthy life and an unhealthy life. It is impossible to go through life without moments of weakness or periods of unhealthy living, but the effort should still focus on minimizing those unhealthy phases as much as possible.