Two more Starwood hotel brands are going smoke free, a trend the hotel operator popularized in early 2006 when it announced that its Westin properties in North American and the Caribbean would prohibit smoking. The two brands, Sheraton Hotels and Resorts and Four Points by Sheraton, will implement a smoke-free policy at more than 300 hotels throughout the U.S., Canada and the Caribbean by the end of the year. Both brands have already begun converting previously smoking guestrooms to non-smoking, a process that can be time-consuming due to heavy cleaning. Starwood also says that public spaces will be 100 percent smoke free. (DE)