how do you put a value on the cost of life/health to society

Smoking can cost you your life. To day the number of people smoking has doubled drastically in the last two years and most of then are teenagers. Most of the health effects are long term and most of them are fable. If you smoke you are guaranteed
That you will look a lot older and even my lead to death. So it is your design life or death. Smokinf is the number one killer in the world.