No more smokers of any kind for me.  

The smoker/pet owner  (been renting this place for 9 years) seems like he is wanting to stay. 1.

@Mike Fletcher I agree that just because it is legal doesn't mean its a good idea for you whether cigarettes or weed but I do think having the choice is important. 

One of the units was occupied for nearly 30 years by a chain smoker.

Looks like they've been on there for quite some time as you can see with the red stains and staining around picture frames (possible smoker?).

Bad ::: The house had an extremely heavy smoker living in it prior to me (previous owner died of lung cancer and I could see why) tar was dripping down the walls and trim throughout the house.  

Here are the numbers:DuplexPurchase Price: 180kRent: estimated at 1k/side, 2k totalMonthly cash flow: 300 w/ property management, 500 w/o (I'm planning on managing myself)Pros: good cash flow, recently updated, good location job-wiseCons: cigarette smoke (one side is significant), both HVAC units are about 25 years old, house is located very close to major road (noisy), some roof/ceiling damage near ventsSFRPurchase Price: 180kRent: 1600 (probably high end of what I could get)Monthly cash flow: 16 w/ PM, 175 w/oPros: completely move-in ready, recently updated, good location, great neighborhood, likely higher appreciationCons: not great cash flowMy calculations are based on: 25% down payment (I'm actually planning on paying w/ cash do close sooner then do delayed financing to free up more money for investing.  

I've had at least 100 inquiries, but it's been difficult to find anyone that isn't a smoker, and has at least a 525 credit score.

Do they give you a blindfold and cigarette first?

I pulled out the carpet out the house so there's absolutely no carpet in the house and I scrubbed the house with vinegar. unfortunately the house still smells like cigarettes and wet dog/ the pet odor smell.