How would the world be different if there was a known available cure for cancer?

There would be 20% more of us.

I'd smoke 3 pack a day.

it would be so damn expensive most people wouldn't be able to afford it and it would most likely be suppressed , the pharmaceutical companies make more money when people stay sick

They’ll be another disease to kill us instead since the population finds a way to stabilise itself naturally

Do you mean like Cannabis?