I've heard that THC can cause permanent damage to brain cells. I've also heard this reffered to anti drug propaganda. Another theory i've read is that temporary effects reduce intelligence but long term results are not affected. If Marijuana does cause permanent brain damage how does it do so? How exactly does it kill the cell?
There is no damage of brain cells, as in the context of lesions in neurodegenerative disorders. There are, however, two mechanisms attributed to the memory loss associated with cannabis/marijuana and these are purely physiological responses.