Those who can, do

Those who cannot, don't. No need to make it any more complicated than that. If I think I should - for health concerns or twisted depravity - stop drinking Dr. Pepper, I would do that. If someone wants to lose weight or get in shape, they either do or they don't. It's ridiculous to think you can get there by reading how-to manuals, gathering research, planning, getting facts together, etc. If one wants to quit smoking, the best way to do so is to ... not smoke. Sure it's difficult to improve oneself. Studying quantum physics is hard too. String theory is hard. Playing baseball is often hard too. Those who can, do. Those who cannot, do not.