Brenda Goodman discusses the recent MRI study of the brains of 20 marijuana smokers and wonders why scientists often insert caveats into their studies, only to abandon them at other times, such as when talking to reporters writing stories about their work: "Presumably, the same person who adds these cool-headed cautions in the study text is the one you’re talking to when they tell you that based on their study, it certainly looks like pot smoking changes the brain."
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