Duty-Free: Duty-free shops can be found in Terminals 1, 4, 5, 7, and 8. Smoking Areas: There are no indoor smoking areas at JFK (this includes electronic cigarettes). There are designated smoking areas outside of the terminals.
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U.S. airports that still allow indoor smoking include Washington Dulles Airport (based in Philip Morris' home state of Virginia), McCarran Las Vegas, Memphis, Nashville, Cincinnati-Northern KY; and Biloxi.
Before the ban, lighting and smoking a cigarette on a plane was akin to ordering a drink and all part of the air travel experience. When the smoking ban became law, it was seen as a critical step in helping to improve public health by limiting people's exposure to secondhand smoke.
Dubai Airport is a non-smoking zone, but there are ventilated smoking rooms located at Terminal 3 - Gates A2, A23, B7, B27, C9, C23; Terminal 2 – Departure Gates; and Terminal 1 – Gate D22.
JFK doesn't encourage walking between terminals as the roads are busy on the inside of the airport loop. However, there are sidewalks available, and it is possible to walk between some of the terminals that are closer together, such as Terminals 4 and 5.
Pilots can and sometimes do smoke in the cockpits of business jets. These can be as large as airliners (see BBJ), but usually aren't. Even when a country and/or airline ban smoking in the flight deck, some pilots will ignore the ban and still light up.