(Newser) – Dzhokar Tsarnaev doesn't sound much like a cold-blooded killer when described by his classmates and friends at the University of Massachusetts Dartmouth. "He smoked a lot of pot," says Tsarnaev's dorm neighbor, Patrick Yaghoobian. "He smelled like it every day," and the smell often drifted from his room in Pine Dale Hall. Tellingly, Yaghoobian says he didn't smell it Monday—the day of the bombings—but he did Tuesday.

"He would smoke with my friends," another student tells USA Today. "I would never look at him and think he was a radical." And Jennifer Mendez says she often partied with Tsarnaev, whom she considered a close friend. "He was really social and hilarious. He was one of those people who would crack one joke and make your night," she says. "It's like finding out your best friend is a serial killer." (Read more Dzhokhar Tsarnaev stories.)

