IF other tenants are complaining that your smoking is disturbing their rights and comfort, and if such complaints are reasonable (e.g. the average reasonable person would so complain--it's not that there are one or two particularly sensitive or anti-smoking tenants) then, yes, the landlord can tell you to cease smoking and potentially evict you if you do not. If you are smoking in public or common areas, or are a particularly heavy or chain smoker, then they might be able to substantiate this. Without actual, reasonable tenant complaints, the landlord would not seem to have a basis to tell you to not smoke, absent some actual anti-smoking clause in the lease.