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It does. You might notice that the inside of a fireplace has practically zero soot, just ash... and the inside of the chimney where it is not actively on fire (hopefully) gets caked with soot. Eventually the soot (creosote really) will get caked up enough to slow the draw through the chimney, causing heat buildup, and potentially a chimney fire. A chimney fire will indeed burn off the soot, but also likely damaging the chimney and possibly burning the house down.

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As a geneticist with a little (very little) background in immunology I’m going to say, idk, maybe? Maybe not. Genes always matter, so sure. But there’s a pretty big stochastic factor with the immune system, a whole lot of environmental factors, and a ton we don’t understand. Starting with the definition of “strong immune system” - and if you can’t define that you can’t answer (or meaningfully ask) the question.

Not an asteroid. One possibility (I'm not sure if it's currently in favor) is that asteroids and comets delivered much of Earth's water. We are talking not one or two, but very large numbers of them.

Another possibility is that most of Earth's water was emitted by volcanoes (which do emit water vapor).

And of course, a mix of the two is also possible.

Either route could potentially explain Mars' water.

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That's a normal immune system. People are living to 90 with all those nasty germs out there. These are people who don't even take vitamin C, prevagen, Zinc, Boost, or have regular spinal alignments and colonic irrigations! Like Toches says, do you want to turn it immune system into a caged rabid weasel that will attack anything that moves? Actually that is what some cancer immune therapies do, but they can have unpleasant to devastating toxicity. Makes sense if you need to do it to fight a fatal cancer, but not a bad head cold.

This is helpful, and makes it sound like genetics have the greatest impact on the effectiveness of an immune system in context…

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Yeah, so a small portion of interstitial fluid (fluid in-between the cells) is pulled into the lymph system. This lymph fluid runs by lymph nodes and such where it is checked for any non-self (virus, bacteria, cancer, etc) things so the immune system can basically take samples of tissue to make sure all is well. This system requires the skeletal muscles and one way valves to help squeeze it through where eventually it dumps back into the blood. It's why you get swollen lymph nodes when you are sick. They have sampled, detected a foreign object, and now have activated to recruit the rest of the immune system to neutralize the threat.

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Everyone has a unique „library“ of cells that fight viruses and bacteria. Which „books“ you have in your library is dependent on your parentage and the epidemiological history of your ancestors. A person can have a great variety of books fighting a specific disease, but only a few for another. So the effectiveness of someone’s immune system is not some absolute thing, but a mosaic of strengths and weaknesses.

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The problem is, if it's too "strong", it starts going after things that it shouldn't, which is why we have autoimmune disorders like:

Addison's disease - where your immune system attacks your adrenal glands, and ruins your cortisol production

Celiac Disease - or gluten allergies (or any allergies for that matter)

Myasthenia Gravis - Where your immune system attacks the bridge between your nerves and muscles, and gives you paralysis when trying to use your muscles repeatedly

Edit: I see that you mightve replied to the wrong reply, and I also just re-explained what PHealthy already did.

I would use the word "Effective/healthy" instead of "strong", and the main ways that people say you can support an effective and healthy immune system are essentially as follows.

Sleep / Hydration / avoiding serious diseases by things like vaccination, as your immune system cant tell the difference between the original thing we vaccinate against, and the vaccine (most of the time, usually natural infection gives a stronger CD8 T-cell response, which is what tells infected cells to lock themselves down and self-destruct without leaking anything out.)