If my chanuka candles have a good smell to them, can I still get pleasure from the smell after the lighting or are they issur in all pleasure?
It is forbidden to derive all forms of pleasure from Chanukah candles. However, it is permitted to use fragrant candles, provided one does not have intention to derive pleasure from them.
Source: Shut Maayan Omer vol. 3, page 332; Kovetz Beis Aharon Veyisrael 117, p. 168, citing from Rav Chaim Kanievsky.