I think you are getting smoke blown at you.

This is the smoke and mirrors.

Reasons have been: requirements state they need xxx to move in, their app states they have only 1/3 of the amount; they've already shared during showing they smoke but yet on app it answer no to the question; previous residence issues.When they pass my due diligence verifications, I pass it on for the paid services part.

Walk through should be done every three months to check all plumbing, windows, doors, furnace/AC, smoke alarms, the entire building.

He also told me that he was involved in a lawsuit where the landlord had no smoke detectors, house burned down, and children died.

They bought tobacco products on a credit card and didn't pay for them. 

You'll also need to hire someone to create as-built drawings for your house (so you can show square footage, locations of smoke alarms, fireplaces, how many beds, etc. and same for your property to show setbacks, easements, parking, locations of trash cans, etc., which you will need to submit to the county with your application.

She is on top of every tenant, knows what vehicle every tenant drives, knows when a tenant has visitors and for how long and she knows who smokes and throws their cigarette butts on the ground. 

Well, I've been living in this house for quite a year now, and the Landlord is always being disrespectful with us and always taking too much to fix things in this 10 years old house that is falling in peaces , last week our a.c broke, it wasn't getting cold, so we asked him and only 4 days later someone came to "help", and the a.c. was working again for 2 days, and then it got it broke (the air made an explosion sound and there was smoke coming out of my son's bedroom air ventilation) so we turned the a.c. off and open the windows so the burning smell would go away and then we called the Landlord and told him about what happened and that we need it him to call  someone to fix it or something, anything.

The majority of the odor was in the attic since the smoke rises.