This bit is interesting:
"
Therefore, the skin may respond to emotional distress as if the body is under physical attack. Protective lubricants are increased (resulting in oily skin) and less critical functions (like growing hair) may be halted."

That explains an increase in oiliness of the skin after a heavy workout- and I'm not talking about the sweating; I find that my normally very dry skin becomes far more healthy when I exercise or do heavy manual labor frequently. I also have found that since becoming a daily smoker, I have had far less of a problem with a dry scalp. I assumed it was simply that I tend to drink lots of water when I smoke, and the exercise bit was just exposure to more sunshine.
This is really neat stuff; thanks for the link and I am printing it out for my boyfriend, who gets fairly severe psoriasis only under times of extreme stress at work. I've been setting him up with anti-inflammatory herb for a back problem; maybe it will help his skin too!

On that note- If any of you have seen a link to a recipe for a cannabis-based skin balm, or have one that you use to make your own, please post it up in the methods section, because a lot of people have asked me for information on the skin calming effects of weed!