Second hand smoke, while an issue if people are being negligent about it, is not one if people smoke responsibly. So, if the government found an effectual way to control second hand smoke, would you then still be against it? I don't see how seatbelts and helmets affect anyone but the intended user. If you are riding a bike with no helmet and hit a car, your lack of helmet is only going to mean more damage to your head, and would not, in any plausible way, affect anyone else. The same with a seat belt; it would stop only yourself , and not wearing one would not make anyone else more liable to injury. And SURE, these things might be safer for an individual... but is that risk not up to the individual to decide on? I mean, so long as it doesn't hurt anyone else? Or does the government have an inherent right to ensure its national security through the (forced) good health and longevity(by minimizing the amount of things we do that subtract from our life) of its citizens?
Same with seat belts. Is the kid going to do it for themselves? No. And even if you were the only one in the car, and by extension the only one injured or dead. There are a number of outcomes to that that don't just involve that single individual. Entire family structures are upended. Emotional damage for others. Economic challenges if the bread winner of the family dies. So, it affects other people.
To think either action only affects the one individual is an incredibly selfish and self-centred way of looking at it. Other people are hurt. I have no problem with safety regulations and standards to prevent people from unnecessarily being injured or dying. Like hard hats on construction sites. It isn't something that can avoided 100% of course, nor perhaps should it. But, if you can make things safer. Why not? That's why we have drivers licenses. If it's in your own house and there's no way someone could police that, then yeah don't bother. And wouldn't be the government's responsibility anyway. But out in public? Sure, protect people.
As for the wages. Employers can set whatever wages they want. I'd support the idea of mandatory cost of living increases, but I don't see that happening. But even then, the wage is what the employer set.... just updated. If you're talking about minimum wage... sure? It's just a couple of bucks. Otherwise you'd just get a couple of cents. Neither is livable, and minimum wage shouldn't really be livable as you want to encourage moving up the ladder and beyond that. But, if you get a couple dollars out of it instead of cents, there's a least a reason for someone to actually want that job.
I don't really have a problem with them having corporations print ingredients and nutritional information. That's for our benefit. We don't need to obey it. It's just extra knowledge. I see that as a useful tool for the free market. By aiming consumers with information that can better make decisions. Heck, you don't even have to use it for health reasons. I mostly want to know which item has more substance to it. More bang for my buck. Also, I don't see what's bad with having standards so that certain bad chemicals and substances can be in consumable goods. Or marking food that has been genetically modified. It's just knowledge, and with knowledge you can make choices.