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Andy Dick may have overdosed on crack earlier this week ... but, we've learned he actually drinks alcohol more often than he uses drugs -- with vodka being his drink of choice.

Multiple sources who have known Andy for years tell TMZ ... the comedian can easily drink more than a fifth of vodka a day ... taking swigs basically from the time he wakes up until the time he eventually hits the hay. Getty

We're told he never has to pay for his alcohol ... because enablers around him will always provide it to him -- making it easy for the troubled comedian to get hammered.

Our sources say people around him will cut his alcohol consumption down by taking a water bottle and filling the top with vodka -- about a shot's worth. However, they leave water in the rest of the bottle to dil

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