It really should be legalized. There is nothing in weed that makes it addictive... all you gotta worry about is the THC... but who the hell cares about that.
I smoked weed once and it made me laugh a lot and I ate 14 Krispy Kreme doughnuts. I've been addicted to Krispy Kreme's ever since. If I hadn't ever smoked weed I wouldn't be hooked on those sugary sweet little abdominal destroying bastards.
If I were the one selling ad space I wouldn't host the ads either despite my political beliefs. The purpose of business is to make money and I don't think big ticket businesses like (pulling companies out of the sky) Coca-Cola, McDonald's, and Ford would be happy having an ad supporting illegal activity to be sandwiched between theirs.
I can understand Ford not being interested, but McDs' and Coke have a lot to gain from aligning themselves with pot smokers. Haven't you ever had the munchies?