I might be useful here. I was essentially a non-smoker (averaged a cigarette every other day or so) who really enjoyed smoking. So I picked up a PV last week hoping it would be a non-harful way to enjoy myself, but after a couple days I have a noticeable wheeze and right after I vape a slight tightness in the chest, that goes away after an hour or so. Been vaping nothing but vanilla/tobacco flavored 100%VG 0 nic juice.