system
Given the following post, respond as if you're commenting on Reddit:
human
How does cancer kill people?

It's my understanding that cancer cells are cells that divide abnormally  and develop into large masses, or tumors. My question is how is that lethal?
gpt
Because it kills of heathy cells, and replaces it with cancerous cells. So if this cancer is affecting a vital organ (kidneys, lung, brain, etc.) then eventually it will cause the organ to fail. Think of it like this, if you have a car, and a small sensor goes out, it's no big deal, it's just a sensor. You drive on without it, but say this sensor is a part of the a circuit, that needs that sensor to work. So after that sensor fails, it spreads to another sensor, that then fails itself. Now that sensor leads to a computer chip that needs those two sensors to function. Because those two failed, now the chip fails. Now let's assume your car needs that chip to function, well with the chip failed, the car dies, and won't run. It's much like that.