To Buy or Not to Buy - Half Duplex with Smoking Neighbor?

[Kathy Lowery]

I'm really struggling with this. I found a half-duplex in an A/B neighborhood (A+ school districts, growing area) that I want to buy. The only downside is there is a smoker next door.  While this is a highly desired area, I'm afraid having a smoker next door will turn-off potential tenants. When I toured the property  I could not smell smoke, only in the garage. The seller was honest and warned me, that sometimes it comes through the neighboring wall.  She did research and found that you can add foam and a second layer of drywall to help prevent the intrusion of smoke.  I have also been looking into air-purifiers to help with this problem. 

Any thoughts on this matter?  

As always, thanks in advance :)