What can we do about second hand smoke in apartment?

what you can do as smoking is banned under the lease, send written notice to the smokers and the landlord that, unless the smoking stops immediately, you will sue them both for nuisance nuisance claims permit collection of attorney fees, your landlord will not want this and should enforce the terms of the lease. a letter from an attorney should be sufficient. the smokers have a right to smoke but only outside. they have no right to smoke indoors, to the extent the term and condition is in the landlord's lease, they are obligated to enforce it as, otherwise, they are breaching YOUR lease because you relied on the no smoking clause as part of the lease. if you are in the tri-county area, I can try to help, otherwise, you will need to find counsel where you are.