@th None of the other choices have had anywhere near the level of public health impacts as the inclusion of tetraethyl lead in gasoline. Like, the scale isn’t even close. Lead exposure in early childhood was a major factor in violent crime rates, and 18-20 years after we started phasing out lead in gasoline, the violent crime rates suddenly started falling. We poisoned entire generations, literally billions of people. Very few, by comparison, ever had contact with radium, heroin, or asbestos.