Hey there,
i guess it depends and walks along with discipline.
To stay healthy and clean, maintain a healthy lifestyle through a balanced diet, regular exercise, adequate sleep, and follow simple own rules like breaks from Poker or specific times. Same for smoking. Its not enough to just say things. You have to believe that to much poker/smoking (in general) is just bad and will not make you a better person.
So the question is not what is more addicting: You have to tell your mind the right way!
Greetings,
Natox