What you quoted doesn't really agree with what you're stating, which is really "it's meaningful to share the cost-benefit analyses because they'll all say it's worth it".

The reason they will not all say it's worth it is because there is nothing "magical" that happens at 4.0 pCi/L. Whether that is the sensible threshold vs doing something else with your money is a very different answer for a non smoker who makes 35k/y vs a smoker who makes 250k/y.