That's what they say. I kept smoking for years because of that claim.
Finally, as I was smoking three packs a day I decided enough was enough.
I quit cold turkey and never looked back. I should have quit years before that.
Shortly after the birth of my second child, I got wise and quit (almost) cold turkey. Oh, I had an occasional smoke on Thursday nights when I bowled, but that was it. My cravings would arise on occasion, but it wasn't long before I completely stopped.
I still enjoyed smoking, I guess I finally wised up.