My theory on drugs is like this
If your ICQ is 125 and after years of frying your brain you're left with 115. You're still Good and smart enough.
If your ICQ is 115 and after frying your brains your left with 105. That you're simply end up as a retard.
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Or as my very good friend Stoner once said, we use 10% of our brains, the other 90% is for drug consumption. Oh he's not a stoner anymore, but Smokey is still very Smokey