ABC News: Health groups are fuming at Hollywood's continued taste for smoking.

A new study by the American Medical Association Alliance, the volunteer branch of the AMA, finds that over the past six years more than half of the movies geared toward children feature characters smoking. In more than a quarter of the movies, actors light up cigars.

And officials say the Motion Picture Association of America has failed to deliver on its vow last year to weigh smoking in the ratings process.

Among the latest study's findings:

•Since 2002, out of 617 movies rated G, PG or PG-13, 57% have featured smoking; since 2007, when the MPAA's stricter policy took effect, 49% have featured smoking.

•Out of 441 movies rated PG-13, 296, or 67%, have featured smoking of some kind. That number has dropped to 56% since last year.

Sandi Frost, president of the AMAA, says the group launched the study after noticing that most of the teen-oriented summer blockbusters, including "Iron Man," "The Incredible Hulk" and "The Dark Knight," featured cigar smoking.