I wouldn't consider "low body weight" to be a habit, but nice to know it's valuable.

I feel like these are all pretty much what everyone already believes. It's good to have studies to confirm and quantify the benefits, but it's hardly news that not smoking is healthier than smoking.

It's rare to see a study that follows people for more than 35 years. Its simple finding: five healthy habits, consistently followed over time, can make a remarkable difference to long-term health.