Which drug has the worst addiction potential?

Which of the following drugs has the worst addiction potential in terms of severity of cravings, pain & suffering of withdrawl, and lowest “complete” recovery rates?

– Alcohol
– Heroin
– Cocaine
– Methamphetamine
– Crack Cocaine

I’ve heard from a fifteen year old heroin addict that heroin is a drug that if you’ve done it once, you’ve done it more than once.

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