If a disease is non-infectious,?

[bball4life]

How do you get it

[KarimF]

Lung cancer is a disease. You get it from smoking.

[hocgoligal1]

Many diseases that are non-infectious result from genetic mutations causing the cells to be dysfunctional. This is the case with cancers where the genetic defects cause the cells to keep growing (they don't respond to stop signals). Of course there are risk factors that increase the chance of genetic mutations and thus the chance of cancer.