Smarter people make better life decisions which leads to a longer life. On average.,(reply>), @william julianelle I think a lot of people's addictions stem from childhood trauma.  Or just making the same mistake your parents did and then coping the same way your parents did using alcohol.,(reply>), Makes sense, that's interesting. I had never heard that until I listened to this interview. I've seen many intelligent people that eat badly and don't workout, and just  don't focus much on their health. Statistically I guess many more do though as opposed to the average population.