Weed or any other mind or body altering substance could be considered performance enhancing. Say you need to smoke weed to compete well. You're enhancing your natural performance.
Now, the tricky part is where you draw the line? Is Gatorade a drug? Is caffeine? According to most racing organizations (biking, track, skiing (xc/downhill, etc.) caffeine IS considered an illegal drug if ingested in large enough quantities. In other words, you could get kicked out of a comp. for having too many cups of coffee (in reality you'd have to have like 1.5-2 pots (12cups) of coffee).
The reason they do not allow drugs is because drugs provide the ingesters with an unfair advantage over the other competitors. Also, in a more traditional sense, sports are about pushing the human body as it IS, not as it CAN BE on drugs.
Also: some of you people need to do some reading. 'Steroids' is a very generic term. Most people who get caught doping are not taking your early 1980s horse steriods. Blood doping, EPO, THB, etc. are the common ones today. They don't give Arnold-esque rippedness, but enhance your body's ability to consume oxygen, for example. Big fucking difference.
I see no point in testing the ski community for recereational drugs because most of the competition would be eliminated. However, on the contrary to what some of you have said, doping provides advantages to all athletes, including skiers. So testing for PERFORMANCE ENHANCING DRUGS would be acceptable. However, we're just back to where I started off--any drug could be seen as Performance Enhancing.
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Carni
vorous
Jesus-I need your FLESH