system
Given the following post, respond as if you're commenting on Reddit:
human
My coworker insists that by walking briskly while smoking, he is not damaging his health. How wrong is he?
gpt
This man should be wearing a helmet at all times.

The air he breathes is still the same, filled with the same carcinogens, and leaving the same chemical deposits in his lungs. He eventually can ~~and will~~ develop lung cancer.

obvious edit.