i just like armor clothing and they dont seem to make it in men's so i would have to cobble together scale and chain mail stuff to fit me but, eh, it works.
and my condolences on your co-worker. i had a family member who used to be a alcoholic chain smoker, so i know kinda where you're coming from. its things like that that made me decide to completely ignore that kinda stuff.
Whatever makes you happy and doesn't hurt someone else.
BTW- If what you are doing makes you happy, but hurts you, then it's probably bad. A pretty nice guy I worked with overdosed not long ago. He may have been happy, but he really hurt everyone who loves him.