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I'd just like to point out that you don't have much choice. There aren't really a lot of physical signs unless you're a heavy smoker, at which point you may get some niccotine stains on your teeth and hands. If she's chewing gum it's to cover up the smell of it, which means if she is smoking she's covering her tracks.
So, yeah. Think about why you want to catch her and what everyone else said.
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