(Full disclosure: I run a small business making and selling flavoured e-cigarette liquid) The levels of diacetyl from a conventional cigarette can be around 750

(Full disclosure: I run a small business making and selling flavoured e-cigarette liquid) The levels of diacetyl from a conventional cigarette can be around 750x that of what you'd get from an e-cigarette containing such a flavouring. Most concentrate manufacturers have removed or replaced any flavours that contain this or other known irritants wherever possible, and provide material safety data sheets for all ingredients. As far as I am aware, there have been no reported cases of "popcorn lung" from vapers or smokers. If I am mistaken or unaware of any contradictory information, I would really appreciate being pointed in the right direction. http://tobaccoanalysis.blogspot.com/2015/12/new-study-finds-that-average-diacetyl.html http://tobaccoanalysis.blogspot.com/2015/12/new-study-finds-...