It's a cold, wet afternoon at the University of New Hampshire, and sitting in the frigid drizzle, a lighted cigarette in her hand, senior Amy Osborne wistfully recalls her freshman year on campus. "Both me and my roommate smoked," says Osborne, 23. "Nobody cared back then what we did as long as we kept our door closed."
People care now. Two years ago, U.N.H. banned smoking in dormitories, forcing Osborne and other refugee smokers to light up outside. Then last April the university not only imposed a perimeter restriction, prohibiting smoking within 20 ft. of campus-building doorways, but also expanded the...