As a concerned tenant, here is what you should know:
There is no HUD policy that restricts landlords from adopting smoking restrictions in common areas or in individual units. You can download the entire HUD letter .
Smoking restrictions are permitted under federal law, including the federal Fair Housing Act, and under Maryland law.
Landlords must also be sure to make considerations for smoking residents already living in their buildings, such as providing a reasonable period of notice, e.g., instituting the smoking restrictions at the time of lease renewal.