Hmmm. Okay, I'll bite.
I checked out the article FIGHT ON linked, and it seemed to me that most of the concerns about caffeine were relatively mild or only anecdotally substantiated.
I did a little looking around, though, about the fibrocystic disease mentioned in the article. There actually does seem to be a correlation (potentially causative) between the two. Being male, I don't have the apparatus they mentioned as having been affected, but I was surprised to find some actual research that, at least on the surface, appeared to back the point.
http://www.pubmedcentral.nih.gov/pagere ... ageindex=1
It's not a recent article, but I didn't research very thoroughly (about 5 minutes) either. I'm not going to avoid all caffeine use, but I will keep an eye out for caffeine being linked to truly terrible diseases that might actually strike me . . . like male pattern baldness.
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