I consider this somewhat different because people who smoke knowingly do it onto themselves. If people think the benefits outweigh the risks, I don't see that as a "failure" in any way.

Passive smoking is the main cause of harm to _other_ people and is unsurprisingly also the thing that's the most regulated. (Smoking in bars etc.)

At this point, isn't non-mask-wearing somewhat similar? The death risk to vaccinated people (for now) is lower than for getting the flu (even with the flu vaccine). So, the risk is only significant to unvaccinated people, who have had plenty of opportunity to get the shot. So the risk here to those people isn't from themselves (like in smoking), but from others - but the risk is their own choice to take?