I know someone who has. They managed to snort around 2 grams. You've tasted it right? You know how much 2 grams of powder is, yes? Well, he spent the next two hours vomiting and did not get high. DONT TRY IT! :D
Umm.. I've snorted salt and pepper... don't try that either. It burned like a mother fucker. Then I puked infront of a girl I was twitterpated over because I can't stand the flavor of pure salt. Yeah. That sucked. (That was right after I snorted part of a caffiene pill.. I wonder why my nose bleeds every time I snort something... hmmm)