Can someone please answer this for me???

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I was just reading a discussion where someone responded that they like illegal drugs better because they stuck to the ones that were not addictive. Okay so can someone please tell me which illegal drugs are NOT addictive? I have never had a problem quitting anything I have tried, but I guess it really all depends on your level of willpower, and how strong you are. I don't personally know of any that do not have a potential to be addictive.. SOMEONE please inlighten me.