He also commented that he smoked occasionally outside.

Upper tenant is smoking in the unit, also a slob.Both rents are paid on time, they have no intention of moving.Do you do anything to fix the water issue, considering the tenants don't care?

You have all these folks that don't even know what to do with a lead spending money sending out this stuff ... when if they were smart they would spend that money getting a RE linense and learn the business and become a RE professional than a wanna be investor wholesaler with no money and what ever credit and money they had just went up in smoke sending out letters with no ability to follow up or keep the campaign going there is no doubt you can get business with direct mail but most don't understand its a multi year commitment and many thousands of dollars. if you just blow your wad and your done then you will be broke and done and off to your cube to work for the man LOLPS I don't send out colleague request as I don't know how to do that I only accept them.

One tenant will smoke inside, sneak in 5 pets and change their Harley oil in your living room and you'll be out thousands.  

Tell them they can smoke outside only.

Unless there is another reason that you wouldn't rent to them (ie; bad credit, poor references, smoking, etc) and you can PROVE that is why they were denied, then you have to consider them as prospective tenants.

I pretty much just added smoke detectors, cleaned it real well, added some shelving and smoke detectors.  

Jonathan Smoke, chief economist for realtor.com, revealed an in-depth analysis of these survey findings during a panel discussion at the National Association of Real Estate Editors conference in Miami.

One was so heavily smoked up that I wouldn't even go inside and my realtor had the same reeling affect.

Period.Good luck, smoke signal me if you need more pointers!