I don't know much biology. But is it possible that Cancer in general is good for you? My reasoning is that Cancer is actually produced by our body to repair cells, but sometimes our body lose control of the Cancer and it becomes harmful. Example, smoking causes damage to lunge tissues. Then our body sends Cancer cells to our lungs to repair the lunge tissues but over a large amount of Cancer, our body might lose control of it then the small amount of Cancer turns harmful. (is there a name for good Cancer?) I know this sounds crazy, can you give me some reasons why this is flawed.