You should consult an attorney as soon as possible. You have several options including writing a demand letter to the landlord, going to Court and getting a temporary restraining order, or calling the police and filing a criminal complaint.
I am so sorry this has happened to you. You may have a strong case for suing the school based on negligent/intentional infliction of emotional distress. I would recommend that you compile all of your treatment records and bills and seek the assistance of an attorney immediately.
One option is to sue your employer for breach of contract. In the alternative you can likely sue for what's called "quantum meruit" / Unjust enrichment. Depending on how much money you are owed you may be able to sue in the Small claims session of the District Court. Before you sue, however, it may be a good idea to have an attorney draft a 30 day demand letter, which may be able to resolve the issue before having to file suit. If you do decide to pursue this option I recommend having an...
If this smoking is adversely affecting your health and well being you may have a right to withhold rent. To withhold rent though you must follow certain precise procedures. I would recommend consulting an attorney as to how to go about withholding rent.
You should contact a Landlord/Tenant lawyer. Also, make sure that the Attorney you consult is familiar with the rules particular to small claims court, as these rules differ from the regular session of the District Court and the Superior Courts of Massachusetts.
I agree with Attorney Kremer's analysis. If you can show that your landlord's lack of security devices to protect you and your property was unreasonable you have a strong chance of prevailing. I would consult an attorney as soon as possible regarding your claim.