Just my thought, but maybe you were used to the higher PG juices which have more of a throat hit. Im just thinking that TH feeling is basically an irritant as was real cigs. Now that you are not inhaling as much PG your throat is "healing"? Anytime your mucous membranes are getting irritated, they defend themselves my producing more mucous to protect itself. This just might be your bodys way of getting rid of the protective coating it made as a result of the PG. I dont like throat hit, so when I was using juices that were higher than 50% pg I was getting a sore throat and phlegm. I hope this helps, Plus another thing I thought of the other day. If you have a allergy to nuts you might look into the ingredients in your juice, some of the organic or natural flavored juice might have trace amounts of nuts that my not throw you into an anaphala.... etc shock but might make you feel sick. I was thinking of that when reading other posters allergies to ejuice or PG. Since PG is what typically binds the flavor maybe the problem is a certain ingredient in the PG, this goes for anyone with fruit allergies such as strawberries. Just a thought. Maybe if people with allergies tried non flavored juices, that might solve their allergy issues. It might not be the PG but the actual flavor.