This is really bullshit. There’s plenty of evidence that second-hand smoke dramatically impacts the health of others. There ARE studies that show higher rates of lung cancer and lung diseases in non-smokers who live with smokers.
There’s even more evidence that second-hand smoke causes impaired lung function and increases the rates of asthma in children who live with smokers. I support most of these laws, including ones that prevent people from smoking around children in enclosed places [such as cars].