Remember: carefully craft the agreement of termination, and have both tenants sign with a notary.This is not legal advice; I write this from my own  experience.  

I started by saying I know it’s legal in CA and I’m not telling you what to do, but my tenants have complained and was there a way they could smoke somewhere else or be mindful of where the smoke was going. 

You'd likely get into legal trouble. 

Not meant as legal advice just how I might handle a similar situation. 

Trusts can be useful, but they’re legally murky and not bulletproof.

Putting the right legal and financial protections in place can shield your personal wealth, reduce your litigation risk, and limit creditor access.

If a license is not required, can you please also share what the rules are to legally wholesale real estate without a license in Sacramento County, California or where I can find the rules?

Medical marijuana is legal and vaping does zero damage to a property.  

What creative (but legal) mechanisms have you seen to protect the buyer’s interest in this kind of setup?

. - So, check local laws to see if you have any legal rights to protect the property from damages or abandonment.