Lyric discussion by thecomaboy 

There's something sweetly sinister about the 'I was smoking him in bed.' It's a cute pun as well.

To me, this carries on the theme from 15 about underage sex, this time in the club scene. You could see the 'smoke detector' as being someone who bums off other people's cigarettes, but as the saying goes, 'there's no smoke without fire', and therefore the chorus is a playful warning to watch out for the peril you can't see.

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