I also visited a white room on my first break through (or close to break through). Unlike many of my trips, I remember it vividly but I've never been able to get back there. The walls were glossy or "liquidy" and I was unable to tell whether they were near or far. There was a large spherical black and white "thing" hovering in front of me that was infinitely folding over itself. While I didn't come into contact with any entities, I did have a sense that I was being observed. Just as I was starting to loose a sense of myself, I kept trying to pull myself back to reality. Even though I was in the white room in my mind I could picture myself lying in bed where I had smoked. It was kind of an out of body experience where I had this feeling that the body I was looking at wasn't actually me but just a body (if that makes sense!). Anyway, yeah, the white room was awesome. Hopefully I'll make it back some day.