You sound like a horrible supervisor. I doubt you would succeed if you took over for my boss. Also I feel bad, but I actually might quit in 6 months and I am literally taking care of so much work that I expect it to be a fucking catastrophe if I give a 1 month notice.
Probably I wouldn't, Chapo. I have no idea how your boss manages drug addicts, I would just fire you and get someone better. I don't have your boss' patience, either. I would not work for a company that got themselves into a situation where one employee leaving will cause a catastrophe. Maybe they should've fired some people early on, and maybe then you wouldn't be in that situation. Food for thought.
They fired plenty of people early on, one on their 1st day as a new boss there. I am certain you couldn’t have done as well.