Its ****ing stupid asking how much some activity "costs" without also asking how much enjoyment people get out of it.
No-one forces people to eat or smoke or drink. They choose to do so because the pleasure they receive from it vastly outweighs the cost to them of being a fat alcoholic with lung cancer, and as long as they pay their way, it is their right to choose what they want to do with their life, not mine, not yours, not anyone else's but there's.