I don't disagree with you. I just wanted to give the first poster I responded to some credit. There needs to be a balance between quantity and quality of life. For some, they will enjoy drinking and smoking. Personally, I think meditation and mindfulness is a better path. But quality of life matters a lot.

Edit: I also didn't mean to imply that I think the key to a long life is simply not worrying. The key to a long life is definitely a combination of genetics and how well you take care of yourself. But part of taking care of yourself is worrying less.