duvan

1. tobacco
   Njegov deda je gajio duvan u Vojvodini. — His grandfather grew tobacco in Vojvodina.
   Cela kuća je mirisala na duvan. — The whole house smelled of tobacco.
   Imaš li duvana? Ja sam ostao bez. — Have you got any tobacco? I've run out.
2. colloq. cigarettes; smokes
   Daj mi jedan duvan, molim te. — Give me a cigarette, please.
   Ostavio sam duvan pre dve godine. — I quit smoking two years ago.

"Ostaviti duvan" is the usual colloquial way to say "to quit smoking".