Why does for example smoking cause cancer? How do various toxins in general make your body start growing cells uncontrollably?
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It’s because of what cancer is: a mutation in the DNA that doesn’t immediately kill the cell, but rather makes it divide (multiply) uncontrollably.
So, various things can cause cancer: radiation, toxins, etc. Anything that can damage DNA can cause cancer. And typically the damaging agent outright kills a lot of cells, but some of them get mutated so they don’t die but go cancerous instead.
Smoking accumulates a bunch of crap in your lungs, and a lot of your lung cells actually die but they’re replaced because the body has a mechanism for replacing damaged cells. But the cells that get mutated to cancerous cells and don’t die, will start multiplying rapidly and taking over the lung “space”, and that will eventually result in lungs that no longer function for you. So you suffocate and die.
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