So, I'm pretty new to vaping, it's only been a few months. I use a Kbox nano, I really like it and haven't had any problems up until now. I just went to a local vape shop that make all their own juices, I been to this place multiple times and had no issues well I went the other day and got 4 different juices with the same nic levels and pg/vg that I always get but this time every single juice I purchased is burning not only my throat but my lungs so bad that I feel like they are going to explode. The girl at the vape shop says she doesn't know why this would happen. So my question is what could be causing this? Anyone have any idea?