Also I’m guessing dark mold on the joist to the left.I’m guessing that’s mold too?

All smoking needs to take place in designated outdoor areas.I even have a tenant who smokes inside his rental.

Again , I agree with your Mom, but I think a subtle down vote same as up vote won't be a dark negative. 

Simple things like how many people, how many animals, does anyone smoke. 

Second thing is to wash ALL window seals and walls, yes walls with either a store bought cleaning aid for smoke or a homemade vinegar solution.

Insinkerator is not working (because of tenant use) And I also find out in 1 room, there are smoking smell (this house is non-smoking house and did mention in the lease agreement) I can't imagine how the house will look like after 1 year contract.What should I do now to prevent any pity in the future?

Add a specific smoking fee.

His apartment is saturated with pot smoke.

If it were me I’d paint the cabinets (semigloss dark gray or color of your choice).

Things have to align, seller can't have already given up and you need to fine a way to make it look like a little light in the seller's dark days.Then you have to present yourself to the lender and ask the possibility of you to beable to assume the current loan if you bring the past due payments forward.