I smoked for 20 years. I loved driving with a Marlboro Light hanging out of the window. I chose to do that to my body from my own free will, and willingly paid to do it. I'm glad I stopped, but I enjoyed it while I did it.

Things that are bad for you can still be valuable. I still willingly buy beer, even though I know it's bad for me.

Value isn't what you think it is, if you think that smoking provides no value.