Don't know about drugs, but.....nailed my first gybe (actually 6 that arvo) after consuming 2 stubbies....took about 2 months before getting the turns right again!

In saying that, that was the only time I've drank pre-sailing, had a couple at a BBQ and a mate called. Now that the training wheels are off, and I'm playing in some waves and rougher conditions, I don't intend on drinking (or puffing/popping/injecting/sniffing) before windsurfing again, for safety reasons mainly, also to get the most out of what I'm doing.
I also reckon that sailing/windsurfing is enough of a buzz, and the beers should be left for the celebratory drinks after!