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Nick Carter says his drug use was so bad it screwed up his brain ... and he blames Paris Hilton.
Nick -- who just wrote a memoir, "Facing the Music and Living to Talk About it," -- says in 2003 - 2004, when they were together, Paris "fed my worst impulses as far as partying."
As for what kind of partying ... Nick says it was all about cocaine, ecstasy and HUGE amounts of vodka -- often a large bottle every night.
Nick -- who's been sober for the last 5 years -- says the ecstasy has screwed up his life. He believes the drug messed with his brain and that's why he's suffering serious bouts of depression.
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