And then that person has kids, and obviously they don't get the mutation. Is that part of the process of human evolution? No. (By the way, you didn't mention t

And then that person has kids, and obviously they don't get the mutation. Is that part of the process of human evolution? No. (By the way, you didn't mention the most common way that lung cells mutate in a smoky environment and begin to divide more often.) Evolution involves random mutations and the filter of natural selection. The process you're describing doesn't participate in the filter, and random mutation alone gets you vastly more downside than upside. The only reason evolution works is because of the filter which lets us keep the upside in the gene pool while the downsides are filtered out.