Smoking Tenants in my House Hack

[Sam Runge]

Hello BP,

I am a new investor and just recently purchased my first property (2 unit/duplex) in which I plan to house hack. I am currently finishing up some renovations prior to me moving in on the 2nd floor.  I can smell marijuana coming up from below and unsure how to handle, especially during these uncertain times from the pandemic.  I have a no smoking on premises section in the lease.  So far they are good tenants.  What do people recommend?  Send a letter restating the policy?  Threaten eviction?  Letter stating it can be smelt and I am aware they are in violation?

I do not have a section in my lease specifically for smoking fees/damages/etc. 

I appreciate any and all advice!!  Thanks!