I see something like this and first look at the source. My first question is why would I trust a study from any interest group any more than I would trust a study from our favorite boogeyman on biased studies, the Tobacco industry?

Without reading the study I can already guess the conclusion. Naturally, their being an interest group doesn't mean the conclusion is wrong, but it does seem unlikely they would push a study that had mixed conclusions or found something contradictory to their study. I wonder how many times, for example, they rebut nameless "critics" of their position and set out uncited positions of those critics rather than specific examples and studies.