How to deal with excessive cigarette smoke?

[Dave Bopp]

Hey everyone!

I have a row home rental with good tenants. I was informed by one of the tenants earlier this month that the cigarette and marijuana smoke from the neighbors in the adjoining row home was causing her nausea and head aches. I attempted to have the landlord next door speak to her tenants about the issue, but she told me that she had bigger problems with them and to just call the police. So I called the police and they told me that there was nothing they could do because recreational marijuana use is now legal in Philadelphia. 

The tenants had asked me to put up an additional material barrier in the basement where they think the majority of the smoke is entering their unit. My thought it re-parging that 40 foot section of wall might help limit the smoke but that seems like a substantial expense for an issue like this and likely won't completely solve the problem.

Does anyone have experience with alternatives for minimizing smoke? Or has anyone dealt with a similar situation? Thank you!