"Heartland Institute" is kind of a giveaway that fossil fuel industry funded antiscience is being peddled. Exxon and Philip Morris have been longtime donors. Not surprising they went all out on "secondhand smoke is harmless" back in the nineties, before they settled on climate change denialism. One of their favorite scams is to pretend that there is no hard empirical evidence for a certain atmospheric effect, that it's all just "computer models. " This false assertion has been debunked many times.