I don't see the analogy. Evidence for fast food being less healthy than a salad is pretty overwhelming, consumers don't care and choose fries anyway. Lead poll

I don't see the analogy. Evidence for fast food being less healthy than a salad is pretty overwhelming, consumers don't care and choose fries anyway. Lead pollution harms everyone, not just the person who burns it. And, lead isn't really needed to avoid knocking. If you want consumer preference to change you need to make a salad that is as delicious and cheap as fries.