In my browsing of this forum, I have found a few threads on this subject. Several posts indicate the their glucose increases with vaping. I tried vaping several months ago and found that mine did too (type 2 using insulin and metformin). I was using a menthol flavored juice. This discouraged me from vaping and I returned to cigars. 5 days ago, I walked past a mall kiosk and stopped to look around. I found that they had tobacco flavored juice and decided to try vaping again. I purchased a disposable with a few carts of tobacco flavored juice. I have monitored my glucose for the past 5 days now and am very happy to report that vaping tobacco jucie (pg-based) has not affected my glucose at all. Hope this helps other diabetics get off cigarettes/cigars.