can't smoke anywhere on SmithKline Beecham's 29-acre Montgomery County campus. Likewise, the pharmaceutical firm of Merck & Co. now bans smoking inside company gates on its 400-acre Lansdale campus.

In Palo Alto, Calif., a new law prohibits smokers from puffing within 20 feet of any public building. In Minnesota, at 3M Corp.'s St. Paul headquarters, employees who smoke must do so at least 50 feet from company doors.