In Expressions^x, American English^x, Present tenses^x

They won't smoke ever since they saw a film on lung cancer. What does "won't" mean here?

http://forums.eslcafe.com/student/viewtopic.php?t=22113&highlight =

Yoong Liat wrote: Hi Goodman You wrote: I have been labeled and called by many descriptions, hinted being “Ignorant” is the first ... I'm not hinting that you're ignorant. I say that if a learner tells me "informal" means "wrong", I'll understand that he says so because he is ignorant. ...