Also US Patent 6,630,507 "Cannabinoids as Antioxidants and Neuroprotectants" http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6630507.PN.&OS=PN/6630507&RS=PN/6630507
That in itself pretty fairly well blows away the myth of brain damage. It's exactly opposite. It protects the brain.