No he was actually pretty accurate baring that 1-6 thing which I've just never heard, could be true. And you can be addicted to anything it's just not addictive necessarily.
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It's not a physical addiction. A very small amount of people develop a psychological addiction which is easily broken, and it's definitely not as high as 1 in 6.
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No, marijuana is not physically addictive. Mentally addictive? Anything can be mentally addictive.