Not only this, but I find it alters the structure of saliva into a more foam-like form. I think I have to admit this actually being a recurring theme during sessions, the weird bubbling foam in my mouth becoming an object of hallucinations, I could feel it taking various exotic forms such as the form of a dragon (I was probably subconsciously thinking of gandalf and his mystical pipe at this point). Once it escalated to me being so excited I spat the contents of my mouth and started searching for my camera to photograph this amazing, most extraordinary saliva until I came to my senses.
No dragons to take pictures of, but hey, it was definately foam atleast.