In my experience so far and what I have been asked and have heard from others. Is that when your juice contains the product PG the hit seems to be harsher and the nicotine has a slight spark to it. From others Ive heard you can lower your amount of PG to help counteract with the nicotine. But what I have came into contact with was that the PG was needed for a harsh hit or itchy throat. The juice is just fine without adding PG to the mix. The PG also seems to water it down or thin the mixture of the nicotine, flavoring and PG.