cocaine
"If caffeine is like putting premium gasoline in your car engine, cocaine is like injecting Nitrous Oxide into your fuel line. You'll be able to produce more work than is naturally possible in the short term. You'll also have a lot of fun, but it'll cause permanent brain damage"
"The argument that 'it's illegal' is unlikely to have any effect: telling a cocaine addict not to take cocaine is like trying to train a dog that has been badly beaten not to flinch when you raise your arm. Taking cocaine is not a conscious decision like this. Doubtless, over time, these reactions can be unlearned. Just not easily"
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