7:40 AM PST -- Sources connected to the network tell TMZ, CBS does not accept any cannabis-related advertising. The sources add they are not aware of any broadcasters who will air such ads.
It's the Super Bowl ... not the Smoke-a-Bowl -- that's the message CBS gave to a marijuana company that wanted to run a pro-weed ad during the big game.
The company behind the ad is Acreage Holdings -- which has a license to grow and distribute marijuana in several states.
In fact, former Speaker of the House John Boehner is on the board -- and has been promoting the company heavily for months.