My first salvia trip was probably the worst. I had some 10x extract and it did not effect me immediately like it should after a small hit. So I kept smokin more and more assuming it was bunk and I had been ripped off, until after about 10-15 hits it finally hit me as I exhaled the last hit. That was the longest 30 minutes of my life, and a million times more intense than any other hallucinogen. Long story short, I ran around confused like hell just wandering and mumbling shit, hearing was severely distorted, and vision appeared to actually stretch / melt. Simply turning my head to look at something and all I could see is a solid blur as the furniture and walls stretched like a bungie cord. This happened with any object or direction I looked at, and it would stretch endlessly across my path of vision.
This madness continued for probably 10-30 minutes, somewhere around there, but it felt like an eternity. A short time later, I tried salvia again in a much smaller dose! The buzz from it felt very irritating, and unpleasant. I would not do it again. For some reason my friends like smoking it though.