1. PG
    Patrick Robinson Patrick Robinson United States says:

    Some people have a slight sensitivity to PG due to it's profound air drying effect and the fact that 90% of people live in a state of mild chronic dehydration.  I vape 50/50 propylene glycol/vegetable glycerin because higher PG tends to irritate my throat and sinuses, still haven't been ill other than a little sinus irritation (5% of what I experienced from smoking for 40 years) since I started vaping.

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