A landlord can ban smoking of any kind. If you are lawfully smoking marijuana and the landlord dos not have an issue with this there is no issue http://www.car.org/legal/miscellaneous-contacts/ca-re-magazine-legal-column/Sept2013/
On the other hand no matter what you are doing no one should shoot a your door.
"What Is Civil Harassment?
In general, civil harassment is abuse, threats of abuse, stalking, sexual assault, or serious harassment by someone you have not dated and do NOT have a close relationship with, like a neighbor, a roommate, or a friend (that you have never dated). It is also civil harassment if the abuse is from a family member that is not included in the list under domestic violence. So, for example, if the abuse is from an uncle or aunt, a niece or nephew, or a cousin, it is considered civil harassment and NOT domestic violence.
The civil harassment laws say “harassment” is:
- Unlawful violence, like assault or battery or stalking, OR
- A credible (real) threat of violence, AND
- The violence or threats seriously scare, annoy, or harass someone and there is no valid reason for it." http://www.courts.ca.gov/1044.htm
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