They sound great and get you enthused, but offer nothing of substance that you can practically apply to get paid. 

Tenant acknowledges the premises are designated as smoke-free and agrees not to smoke and will not allow any of their family or guests to smoke on the premises, either inside the unit or outside on adjoining grounds.Tenant agrees to abide by this no-smoking policy.This includes smoking tobacco, marijuana, any other substance and/or vaping chemicals.

You also know she's smoking in the unit (doesn't matter if it's a legal substance or not; smoking shouldn't be allowed indoors). 

Uninterested third party opinions (in my experience) do more harm than good.

When the home inspector walks through, and if he can find ANYTHING of substance that causes alarm, you can then further negotiate for seller credits. 

Thankfully everyone is ok and no snakes were harmed. 

Not that we allow smoking of any kind in our units, but tenants break rules, and I've never had a problem with lingering weed smoke, whereas cigarettes can seriously harm a unit to point you need to put thousands of dollars into remediating the smell.

If you're in the 45 day period and lose a property it's no harm no foul. 

I do agree it sounds like a scam especially if they use the words "too good to be true" but what's the harm in seeing if they are legit like some of the people have mentioned on this thread?

No harm making offers based on value and amount of time a house has been sitting.