You bring up a good point: they quit for good. If they pick up a cigarette again 10 years later, they're probably hooked again.
I am a former smoker and if I smoke just one cigarette I will go back to smoking more or less a pack a day, which is what I used to smoke. It happened to me once when I smoked one at a wedding and then it took me about eight months to quit smoking again.
The guy with the ironic name for this advice has a point:
I understand that seen from the outside it looks ironic to some extent, because poker has not brought me problems, it has been like an extra part-time job for many years. Although nowadays I play less and less because of boredom and because I already earn enough money in other ways.