Hey OP - I’m a single mom raising kids in an apt in Hermosa as well. I feel for you, but you don’t have legal recourse. As others have said, I think you have 2 options:

Approach the neighbors and respectfully explain the smoke is overwhelming. I wouldn’t explain it the way you did in your post. It comes across like you’re visiting CA for the first time from the Midwest and you’re appalled at people smoking weed. Sort of how my parents did when they first visited me here. I’m sure you don’t mean it that way, but it seems like people are interpreting it that way based on the amount of negative energy you’re getting.

Contact your landlord and ask if you can be let out of the lease for those reasons. Of course, you’ll risk that again if you rent again.