You might be sold the wrong salvia though if you do that. Every smoke shop I've been in has had it.
I actually smoked 20x extract with a friend last night JUST to prove you wrong. My friend, who loves the stuff, was totally tripping nuts, and I had the exact same awful experience I had the last two times.
Why do you insist that everyone experiences the effect in a positive way? I'm perfectly capable of reading the label of what I'm buying, and if the fact that I've received it from three totally independent sources with the same results doesn't convince you of that, then you're just being thick. It's widely believed that MOST people do not have positive experiences from smoking it!
[edit] I said "last night with a friend last night," which made me laugh