To find out which colleges are out-smoking the rest, the Princeton Review surveyed 140,000 students in 385 schools, asking them, "How widely is marijuana used at your school?"

For many, toking up has been as integral a part of the college experience as ultimate Frisbee and late-night study sessions.

And while the activity has often been shrouded in secrecy, the mainstreaming of marijuana now has college students openly discussing their smoking habits.

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Ivan De Luce ~ Business Insider ~