We all know inhalant abuse is bad. However,this doctor has scanned over 55,000 brains and says inhalant abuse damages the brain function worse than any other drug. Using a SPECT scan, he noticed decreased blood flood to the brain which inhibits one's ability to process. The SPECT scan produces a 3-D image of organs to examine how they function.
Specifically, he references a brain scan from a 17 year old inhalant abuser who had used inhalants for 8 months. Admitted for hallucination, the scans revealed decreased blood to several areas in his brain.