Okay guys, let's see if you can help me out. I've been vaping on a bubblegum flavor by Viper Vape at 24mg nicotine. The throat hit was harsh at first but I've grown to love it as it has mellowed out. Last week, unfortunately, I ran out of ejuice, so I went to a local B&M. The owner said he mixed his own flavors and I tried and purchased a cherry and vanilla flavor at 18mg nicotine. For some reason the throat hit has been much more harsh than my 24mg juice, and I get this strange feeling in my lungs when I exhale. It doesn't hurt, my lungs just feel tight and uncomfortable, sort of like hunger pangs. At times it even causes me to start wheezing. The only other difference I can think of besides the nic content is the change from 50/50 pg/vg to 30/70 pg/vg. If any of you could help me out, I would appreciate it. Sorry for the long post.