In a story April 7 about marijuana and tobacco, The Associated Press erroneously attributed a portion of a comment from the New York City Health Department. The official who said there was "no safe amount of tobacco to use" was the department's acting director of tobacco policy, Dr. Achala Talati, not drug policy analyst Rebecca Giglio. The story also erroneously reported the university where Sterling McPherson is a professor. It is Washington State University, not the University of Washington.