There are some specific problems with survey studies that could lead to an overestimation of the benefits of electronic cigarettes. One major problem is that a survey study of the use of advanced vapor products would result in a severe bias towards finding a high level of effectiveness of these products. The reason? By the time smokers advance to use products like open-ended systems, they have already experienced success, fulfillment, and enjoyment with vaping. In other words, limiting the sample to users of advanced vapor products filters out the majority of e-cigarette users, who do not experience great success and therefore don't go on to the more advanced products.

I knew going in that measuring the precise amount would be crucial especially if I made a recipe I wanted to replicate in the future. This is why I ordered a boat load of syringes and a few with larger gauges as VG is very thick in room temperature. As I said before I was shooting for 10% flavoring so in a 10ml bottle, I needed 9ml worth of base (VG). I took the 10ml syringe, pulled 9ml of VG out of the tub, and put it in the bottle. That was the easy part.

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