Yo Laura

I know you think I'm crazy, but the reason your son is depressed and obsessed is because he works in a freakin Jiffy Lube!

You gave him your lung infection and now he's breathing toxic fumes all day.

-Breathing Aryl-Hydrocarbons (petroleum fumes) reduces the immune response to lung infection, insuring it will become chronic.
-And the iron in exhaust triggers endotoxemia and psychosis.

I'm not crazy and neither is he.  Your once cheerful boy is sick and being poisoned and needs to quit his job before he gets worse.

/end rant.