Yes, Smoking Zones are available at Bangalore Airport.
Outside Terminals Smoking Areas
Terminal 1:
There is one Smoking Cabin right outside 1st Departure Terminal (Near Mayiaas) and one After last Arrival Terminal (Behind the Left Luggage shop after Chai Point).
There is a big one available in the Restaurant/Flea Market are outside the terminals, it’s bigger, better and right next to the beer joints such as Windmill Craft, also there is a Cigarette shop next to it (near Cafe Coffee Day (Google Maps Location), enjoy:
Terminal 2:
There is one Smoking Booth outside arrival at Terminal 2, next to the Airport Taxi boarding area:
Smoking is also allowed at Designated Smoking Areas, and Parking area.
Inside Terminals Smoking Areas
Domestic Terminal 1:
At Terminal 1 (T1), opposite the domestic lounges take the there is escalator and go up, you will find the Smoking Area right there. Also, there is a Cigarette Shop next to it.
Smoking Room Next to the Restrooms, right after the restaurants, near the washrooms (Google Maps Location):
There is another Smoking Room in the end of the Terminal, opposite Gate 44.
Domestic Terminal 2 (New Terminal)
At the new Terminal 2 (T2) of Bangalore Airport Smoking Zone is available opposite Gate D24 and also opposite C3-C4 gates.
After security, walk through the bars and shops towards gates C2 to C6.
International:
There are Smoking Areas available inside the new International Terminal (T1).