SAlvia is nothing like marijuana, not the same effect whatsoever. The first time you take salvia, you may have minor hallucinations such as :Things turning into blocks, things turning one color, or other colors, visual distortions, and you will more than likely see eyes or limbs in places they shouldint be.
When i did salvia, i had a very crazy experience. I felt like i had 4 arms, and i actually felt all four of my arms, and i could move them and such... I think salvia links you to the minds of other species or something, its truely spiritual, there no denying that.
Some people say that they have travelled to other places when they were just sitting on their bed. Its usually described as "Lady Salvia's Forest" Many people have experience this dimension, which is hard to reach without good salvia.
People decribe it as a jade green lit forest within their room, with vines wrapping around their arms, and seeing lady salvia herself, with these vines pertruding from her. Some people have been transported to space, or other transcendal dimesions. It all depends on how much you smoke...