Do Mormons have poor mental health?

[MikeWaters]

http://news.yahoo.com/s/nm/20080306/...ntal_health_dc

Vermont leads the United States in marijuana use, while Utah has the highest number of people reporting mental health problems, U.S. government researchers said on Thursday, based on a new state-by-state report.

Utah has poor mental health despite having some of the lowest rates of substance abuse (or because of low rates of substance abuse?).

So what is the deal here? Are Mormons unhappy?