I think they (Ohno and Matsujun) do smoke in real life, Nino definitely does. Look at his gums in his pictures from some time ago, they were so dark. He was quite a heavy smoker. But when Johnny's had a new no-smoking rule, he quit. Not sure if he quit smoking for good, but he mentioned about quitting in his Jweb blog last time.
I definitely have a sneaky suspicion (
) that Sho and Aiba smokes too. Or at least used to...
It's good that they had the no-smoking rule. They're vocalists after all; smoking's bad for their voices.