I spent some time looking on the forums how to get rid of the pot smell in my rental. A lot of people claim it goes away pretty easily. That was not my experience, but then my tenant turned out to be a dealer (and constant user) of the “good stuff” that’s unbelievably potent and laced with extra THC if I’m not mistaken (the white waxy stuff). 

Anyway, ozone was not doing the trick, which is what most recommended. I ozoned the hell out of the common areas to no avail. Even wiped down all the walls and floors with a vinegar solution which helped, but still not enough. And no, there was no carpet, but LVP. Then I saw somebody recommend just leaving out bowls of vinegar to evaporate, and I realized I could do one better. I immediately bought a humidifier on Amzn for next day delivery and used it on high with a 1- 3 part vinegar-water ratio. Ran this all night on high in the common areas to where you’d walk in in the morning to a haze of vinegar cloud and start coughing right away. THAT did the trick. I did this twice for the worst areas and still alternated the ozone machine. Did each room for 3-4 hours, putting the humidifier under the ceiling fan turned on high, sucking up the mist and moving it over all surfaces. Be sure to close the HVAC vents or turn the HVAC off when doing this to get maximum effect. 
You could even put a humidifier in front of every HVAC intake and run the system on low fan with the filter taken out if needed. I did let my system run the second night I ran the humidifier to help clean it as well. 

I hope that helps the next LL who runs into the same issue! This nasty, high intensity MMJ is getting all too common. Though I understand some take it for medical purposes, I would strongly encourage you do independent research on the health ramifications of this stuff, especially as it’s gotten ridiculously potent. The studies coming out are scary and point to a major health crisis down the road in my opinion. 

Best wishes all, and happy landlording!