Which of These Illicit Drugs Is the Most Brain Damaging?

Question by DJ: Which of these illicit drugs is the most brain damaging?
I’m doing a research project for psychology and the topic is about neurology. I came across an interesting graph on this site:

http://faculty.washington.edu/chudler/wdrug.html

But the graph is ranked by physical addiction and physical harm but not brain damage. My question is which drugs from the following list causes the most brain damage (negatively effects cognitive ability, concentration, and ability to learn; instead of just causing physical dependence) in the long term and not just under influence or coming down from the effects

Marijuana
Ecstasy
Mushrooms
LSD
Alcohol
Cocaine
Meth
Any other drug listed on the above website

Best answer:

Answer by dontbelievethehype
LSD , i heard something like if you do LSD four times i think, you are considered legally insane in the court of Law.

Answer by ?green goddess?
i would imagine meth, but i don’t know a ton about drugs so that’s just a guess. but marijuana does kill brain cells so…

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