Alcohol and marijuana rank near the top of the list of practices Americans consider morally acceptable. Only birth control, at 91%, gets a higher percentage sanctioning it than drinking alcohol does. Smoking marijuana trails birth control, drinking alcohol and divorce (76%), but is on par with widely accepted acts including gambling, sex between an unmarried man and woman, gay or lesbian relations, stem cell research, and having a baby outside of marriage.

Americans are least likely to regard married men and women having an affair, cloning humans, polygamy and suicide as morally OK. Their opinions are most closely divided on morality of abortion — 43% believe it is morally acceptable and 48% believe it is not.