WASHINGTON - Porn is like heroin, researchers told Congress yesterday, asking for money to study "porn addiction" and launch a public health campaign about its dangers. The Internet is the top source for porn that corrupts kids and hooks adults into addictions that threaten their jobs and families, anti-porn advocates said. They called for billboards and bus ads warning people to avoid pornography, strip clubs and prostitutes.The Associated Press Originally published on November 19, 2004