Is there designated smoking area at arlanda airport?

YES, I passed by FRA in JULY 2008 and smoking cubicles have been commissioned and are located near the duty free area in Terminal B. Terminal 1 departures B, level 3, near SEB-Bank Schengen A,...

There is a smoking area under and behind the escalators that lead to/from security at ground level, in the rear before the restrooms. There used to be two smoking areas in the upper (secured) level...

No.

Yes there is (many)

Depends on wind direction and flammable materials.