Soreness, Soviets, and Cocaine

It has been some time since my last non-poem posting to this blog, and I feel the time is ripe for another. Here are just a few updates on my current state of being. I can run again, but the result of six weeks of inactivity is muscles so sore/tight that even walking has been awkwardly misbalanced and slightly uncomfortable. I'm stressed out beyond belief right now because a huge amount of important work this week; however, strangely, the pressure is making me feel better in some ways because it makes me work like a victim of the Soviet Gulags. Unfortunately, I've also stumbled across several instances in the past several days in which my own efforts, valiant though they may sometimes be, are totally misguided and incorrect. This is not conducive to a good self-image; I'm fighting the idea that I can't get anything right. On the other hand, I am tending to really enjoy the work I'm doing, something that's never really happened before, so the time I'm spending on wrong answers isn't exactly time wasted.
Life is, in general, good.

Now that life-news has been updated, if somewhat incompletely, there's a serious question I'd like to pose. First, of course, the background story leading up to said question:

The other day on the bus, I noticed a strange sight. There, past the oddball old guy with a ponytail and eerily splotched skin, past the sweater-clad CMU student, all the way at the front of the bus, on the wall behind the driver, was a poster. Most Port Authority of Allegheny County buses have a poster similar to this, often advertising a study on depression. What caught my eye about the poster I saw on the 61B the other day was not simply that it wasn't for a depression study, but also the content was so exceptionally unusual.
The poster requested people with bipolar disorder, which is completely understandable as it's a relatively common problem and medical studies must obviously look for such individuals to learn more of their disorder. The part that blew my mind was the large print words near the middle of the ad. These researchers didn't just want people with bipolar disorder, but wanted bipolar crack addicts! "Are you addicted to cocaine?" the poster asks its readers.

I simply marveled that there was a potential correlation between cocaine and bipolar disorder; does anyone know if this combination of problems is a common occurrence?