I get a lot of neck and back tension and frequently crack it. Yes, it is possible to have a stroke from this. A friend of one of my relatives had a stroke from cracking her neck which led to paralysis from mid-stomach down. She was in her early 20s when it happened. The odds of something like this happening are very very slim though.
If you are moving your head so much that you see stars when you crack your neck you obviously are doing too much and could seriously hurt yourself though I doubt you will break your neck...
Simply humans are built to MOVE. Sitting in front of a computer all day puts a huge amount of strain on your bodies. One thing I have recently done is setup a workstation in my office that allows me to work at my computer STANDING UP. Wow, what a difference. My back and neck are so much more relaxed now. I still do have my sit down desk, but I use a big exercise ball for my chair now. That helps a lot too.
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