Unfortunately, I tend to agree. The big red flag to me is the use of online surveys. These are difficult to get behind, especially when sent to pre-biased individuals (vapers on e-cig forums).... many of us, myself included, would view it as a opportunity to show vaping very positively, over-reporting the negatives side effects of smoking and the improvement in these symptoms.
However, I do like the fact that he included long-term vapers. This is something that has been severely underrepresented in studies that I've seen, and gives debate ammunition against the "we don't know the long term effects" argument.
This study is not a whole lot different than the anti-vaping studies out there, if you really boil them down. Carl Phillips has documented frequent flaws in "peer reviewed studies" that are critical of vaping, such as these "peers" being fully entrenched in the anti-tobacco religion (and the associated bias) -or- having unrevealed ties to BT or BP.
And anybody can pay to publish a study and generate buzz, it doesn't necessarily mean it is real. Here's an excellent example (link broken, just in case):
http://www.cbsnews. com/news/how-the-chocolate-diet-hoax-fooled-millions/