I am not saying research like this should be dismissed, but, when reports like this come out I wait to see what the study actually says, subsequent studies and the peer reviews related to it before I jump on that bandwagon. This one may turn out to have some merit, depending, given the multitude of nicotine studies that prove nicotine has a profound effect of the immune system.
Presently the FDA and NIH, in conjunction with one another, are throwing hundreds of millions towards studies/research like this (and requesting specific studies to be done related to ecigs) and every researcher/college is clamoring for a piece of the action and also to be the first to put something, anything, out there to the public, some, are going so far as paying to have their findings published themselves...
Most so far are just preliminary findings, think about it, how can they not be given the short time span, while others are anecdotal surveys, not actual "studies" at all although some are calling them that, skewed one way or another depending on which way, pro or anti, the survey takers lean.
I say take it in if it is important to you, keep on top of it to see subsequent findings and make up your mind after all the facts are in.