Well I don't think it's a "myth", VG is most def thicker than PG, and that is where the problem rises from. It prevents the wick from wicking properly, burns things out, etc...maybe you all have just been lucky. But I've used 70VG/30PG before and it killed my atty's in under a week, then I've gone back to 80PG/20VG and my atty's last me 4-6 weeks lol...