People should only be spokesmen for products they truly deeply belive in. For example, I know that I know that down to the bottom of his heart, Billy Dee Williams is a Colt 45 man, and always will be. Thus, in order to be sponsored by a tobacco company, a racer should have to drill a hole in his helmet and be smoking on the starting grid. Also, when he wins, he should mount the podium, affix the Majickal-ballcap-of-tire-manufacturing, then some umbrella girl should hand him an unopened pack of his favorite (i.e. the sponsors') smokes. he should open, take, light and drag deeply. then, and only then should he accept his trophy.
Yes, I am joking, but only a bit. Barry Sheene actually did both those things. And had perfectly healthy lungs till the day he died!
I say, Truth in Advertising!