Tupakoivilla
Tupakoivilla is a Finnish word that appears as the plural adessive form of the participial adjective tupakoiva, which means "smoking" or "the smokers" depending on the context. The root comes from the verb tupakoida (to smoke) and the related noun tupakka (tobacco). In practice, tupakoiva is used to describe someone or something that smokes, and tupakoivilla is one form used when describing a plural referent in the adessive case (indicating location, accompaniment, or state).
Grammatically, tupakoiva behaves like an ordinary Finnish adjective or participle. The basic singular forms are tupakoiva
Usage and nuance are important. In everyday Finnish, people more commonly refer to “tupakoivat ihmiset” (smokers)
Etymology and related forms: tupakoiva derives from tupakoida, with related terms including tupakka (tobacco), tupakkatuotteet (tobacco
In sum, tupakoivilla is a grammatically specific plural adessive form of a common Finnish participial adjective