The same you can smell gasoline. It’s molecules are volatile and they evaporate rapidly. You can smell almost any food on someone’s breath if you’re close enough but the molecules from a grilled cheese don’t evaporate into the air readily so the smell doesn’t carry very far. The alcohol in your blood stream ends up in the fluids that you secrete, such as saliva, but it evaporates readily into the air so you smell it.
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