Second hand smoke isn't a great example as it is NOT tolerated in many places. You can't smoke in most public indoor places (and often outside of these places). The place it is tolerated is in the homes of smokers - where children and spouses and roommates get subjected to second hand smoke. To try and police people's homes is, frankly, a logistical impossibility, and runs into government overreach questions. "In Chicago, 2 out of 3 people infected knew the person that infected them. 3 out of 4 took place at home. So people are going out and catching the virus and then spreading it to their families in the majority of cases. This isn't a "I'm gonna live my life and if I die it's on me" thing. It's a "I'm gonna put my family in danger" thing." Given that people are most likely to infect their family members, it seems like second hand smoke is a good comparison. It kills an estimated 40,000 people per year so it's still a major public health problem that gets little attention anymore. Vaccine non-compliance is largely tolerated in our culture. Vaccination rates have been decreasing for a while now. Waivers are very easy to get in many areas. There are mainstream politicians promoting vaccine skepticism with almost no pushback. There are even people this board that have stated their vaccine skepticism, again with little pushback. Your argument that 'schools, the military, and hospitals require it' (pardon the paraphrasing) doesn't hold water. Schools, the military, and hospitals require COVID compliance too. Those facts strengthen the comparison. There are important differences between second hand smoke, vaccines, and COVID and I am not arguing that they are identical. However, they're not bad comparisons for many purposes and they are better comparisons than obesity.