The Gas Contains Lead

It used to be that gas was deadly, now it's just socially unacceptable.

"Contains Lead" is the warning - Lead was added to gasoline as an anti-knock agent and to improve octance. It was phased out, if memory serves, sometime in the 70's but the soil adjacent to old roads still has higher levels of lead. So now you've been warned, don't eat any of the dirt next to old roads.