And, they added, their results were the same when they only focused on people from middleclass families. 듀크 연구팀은 마리화나에 노출된 쥐를 대상으로 한 다른 연구에서도 비슷한 결과가 나왔다고 언급했습니다. And, as they pointed out, rats dont go to school or fall into rich, middleclass or poor categories.