When you snort a powder, it coats your sinuses which are located in the back of your nasal cavity. It then follows the path of least resistance which is straight down the back of your throat.
Now why are you so concerned? You snort, you drip, end of story. Are you upset that it doesn't run out your nose or something?
Adios,
Steve
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Cynicism is my whisky, and I had a few. - Bruce McCullogh
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AIM: BagOBison