[seveneightn9ne]

No, smoking is usually defined as smoking daily. But there's so few people that smoke less-than-daily that they aren't usually included in these sort of studies so it's harder to say what sort of effect it has.

[thebean11]

Seems pretty common in my experience, pretty much always "I only smoke when I drink" folks.

[Smithalicious]

Is there really that few people? I know several people that only smoke occasionally.