When the brain does not recieve enough oxygen because of sudden changes in blood pressure. Its common to happen if you smoke some really potent marijuana and rise up too sudden. You may feel lightheaded in the beginning and experience some dimmed vision. In severe cases you may see alot of "stars" and have even more dimmed vision and it can be really intense and often leads to a panic attack. It may last up to 10mins or more. The only way to avoid this is too maybe eat something before you smoke or dont smoke so mutch if it is really potent.
by rndanny November 21, 2006