The great thing about a smear is that no matter how false it is subsequently shown to be, it never goes away. The pharmaceutical industry are masters of black propaganda, and this is one of their primary methods.
You can see from the source of the funding for this study - routed through a third party to obscure the actual source - that the agenda is to discredit ecigs by fraudulent research. There are endless examples of this where the funding source was not obscured, and the trail always leads back to pharma. Pfizer for example have spent a fortune on junk science to try and alter public perception of ecigs, and to affect regulatory policy.
In this case, deliberately hiding the funding source tells you all you need to know about the validity of the research and the agenda it was fabricated to align with. Pharma are desperate to protect smoking as the disease it causes generates a significant percentage of their income - probably about $150 billion of their $1 trillion global revenues this year. A drug supplier has only one goal after all: move product, at any cost. The more sick people, the better; the sicker they are, the better. Pharma can't afford to see this giant revenue channel shrink.
Smoking is better than war, for pharma, and they will do anything it takes to protect it. THR is the only real threat to smoking in the West, now, so it must be stopped. Luckily the EU is all about protecting giant corporates and government tax revenue, so they have it under control there: Swedish Snus is banned, and although the ecig ban failed, a gradual strangulation will be employed to solve the problem. In the USA some help is needed, so if the public can be persuaded that ecigs are evil, then cigarette sales can be protected. Expect a lot more of the same.