I will let others with more experience answer this one, but I myself just started vaping 2 days ago, and sometimes I get that harshness too (I use 24mg.) Many people here say that there is a learning curve to vaping, and I would have to agree. You will have to learn to inhale differently, and unless you are alergic to PG, you should learn to adjust with time and practice.
How does a person know if they are having a problem with the PG as opposed to too strong of a strength or just getting used to vaping? I switched to a grape flavor at 18 mgs. The grape is too sweet for my tastes (obviously I didn't make the right choices
What is it like for others say the first few days of trying them? A few problems like I stated? No problems at all other than adjusting to the drawing technique?