Grammar rules are made to be broken. Selectively breaking the rules wakes up the brain and draws extra attention to your message.
Malcolm Gladwell, in The Tipping Point, says that this "ungrammatical and somehow provocative use of 'like' instead of 'as' created a minor sensation" in 1954 and implies that the phrase itself was responsible for vaulting the brand to second place in the U.S. market. Winston overtook Pall Mall cigarettes as the #1 cigarette in the United States in 1966, while the advertising campaign continued to make an impression on the mass media.From http://en.wikipedia.org/wiki/Winston_tastes_good_like_a_cigarette_should#Grammar_controversy
