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> You can control the side effects you may get from a medication you take?

You can eliminate unneeded medication to eliminate side effects.

You can reduce or change your needed medication to control side effects.

You can change your lifestyle to eliminate the need for medication.

Even if there is no way to eliminate your need for medication, you still don't necessarily have to accept bad side effects. Doctors make mistakes and the standard treatment doesn't work for everyone. The first medication a doctor prescribes is often a poor fit. Doctors sometimes need to be prompted to look for better alternatives.

> I get that most people on HN, can control the air they breath as they have the means to decide where they want to live, this isn't the case for most of the people.

Even with very limited means, there is still likely to be something you can control such as: how close to major road traffic you live, how well-ventilated your home is, whether you allow unnecessary particulate or VOC sources in your home, whether you exercise outdoors on days with higher than normal pollution levels, or whether you go running near a highway or at a park. These simple things can have a significant effect on one's air quality.

> Cancer is literally just a numbers game, people in perfect health at their PEAK get diagnosed with cancer.

Cancer has controllable risk factors. There is overwhelming evidence that we can take reasonable actions to significantly reduce our risk of getting cancer.