Smoking kills your PG-13 rating
The Motion Picture Association of America plans to rate movies more harshly if they feature smoking.
Said MPAA head Dan Glickman, "Smoking now joins other vices from which we must protect our children, including sex, violence, drug use, public drunkenness, foul language, bed-wetting, David Arquette, cleft lips, loose stools, the War on Christmas, halitosis, the quadratic formula, the running of the bulls, and especially...the elderly."
"But," added Glickman, "ratings will never attempt to protect audiences from crappy movies which are the red-blooded right of every American man, woman, and child."

