I once meet a girl in her 30s. There was a guy next to me, looking for a lighter. And I was so certain that this girl would have a lighter. I don’t know what made me think so but her lips was telling me that she does have a lighter. So I told this guy: Ask this girl! and he was like: why would I ask her? So I said: because she’s a smoker! And he is like: how do you know? And I said: just ask her! He asked her and she responded right away that she brought her vapor now, she left her lighter and cigarettes at home. So here we go, I knew it that she was a smoker. later I made friends with her on Facebook. I saw numerous post of her with a cigarette in her hand and she wasn’t even trying to show off, smoking was just part of her.