I spent $450 on my latest vape mod (solid copper/indestructible/will last forever) and $100 on the atomizer (stainless steel/indestructible/will last for years) that sits on top. That is less than three months worth of cigarettes for me. The only expense I will have moving forward is the liquid which will cost me $52.20 per month and that's if I don't mix my own liquid. I was spending $192.50 per month on cigarettes so my savings is pretty darn good. If I mix my own my costs plummet to roughly twenty cents per day. The authors of this study are obviously not aware of the vast array of vape gear out there and the actual real world costs that vapers are enjoying.