I saw this thread on another forum and I thought I would re post it here as the thread has been closed off. I also found that this to be a problem and I do drink plenty of fluids when vaping. I noticed this in particular when I tried an e-juice that a friend sent me which was 70VG and 30 PG. That really caused a problem. However, when I went back to my normal mix of 50VG and 50 PG the problem was gone. I also spoke to a pharmacist about this and he told me that PG is used to treat constipation in suppositories. Interesting. I thought I would share this thread and see if any one else has had this problem.