While I agree with what has been said to warn you, let me build on it and see what you COULD do instead.

I've also been warning wholesalers about this for about 2 years.

That would be his issue with his lender.You would have the option of forcing him to complete the deal, he then has to work out the problems between himself and his lender, that is none of your problem or business.Have your attorney or the real estate agent's broker send a strongly worded letter as a warning about the consequences ( a lawsuit he is unlikely to win).

"we are fair and firm" "we issue one warning" "we follow the lease to the t" etc..

If you do, you risk getting bad reviews even if you warn people. 

Quote from @Kevin Sobilo: I would just warn that it's not advisable to connect two circuits to one breaker.

Usually, a warning is provided first. 

Just a warning to others.

Even though i am 26, employed, have savings, and a stable job - too much protection is never a bad thing.However, i find it very sketchy and somewhat car salesman-like that all these companies keep spamming me with mail and warning me of "last notice or else i will never be able to protect my mortgage ever again."

Hopefully, you have a clause in your lease that states the tenant must return the property back to you in the same or better condition as they received it.You may be able to use this clause to warn the tenant to smoke outside or face damage charges as smoke damage is not normal wear & tear.