The Illinois House on Tuesday approved a ban on therapy supporters say can change the sexual orientation of young gay people.
There was no debate on the measure before it was OK'd 68-43. The bill -- HB217 -- now goes to the Senate for approval.
Rep. Kelly Cassidy sponsors the bill which gay and lesbian advocates support. The Chicago Democrat said conversion therapy can increase the risk of suicide and "mental anguish" in teenagers struggling with their sexuality.
The initiative would prevent mental health providers from using the treatment on anyone under the age of 18.
Just last year, the House defeated a similar Cassidy plan 44-51 -- with 22 members not voting.
California, New Jersey and Washington, D.C. have enacted bans, and the first national bill banning the practice was introduced into Congress on Tuesday.