If you start noticing people standing outside airport smoking rooms taking thumbs-down selfies, here’s why:

Inspired by the U.S. Surgeon General, Dr. Vivek Murthy, who posted a selfie of himself on Facebook giving thumbs down to a smoking room at Hartsfield-Jackson Atlanta International Airport airport, the non-profit Americans for NonSmokers’ Rights is starting a selfie campaign to get other anti-smoking fans to do the same.

ANR – and others – maintain that ventilated airport smoking rooms at airports – and elsewhere – really don’t address the health hazards of secondhand smoke exposure or prevent the smoke from drifting out into the indoor shared airspace.

And while hundreds of airports in the U.S. are completely smoke free, there are some major airports that still have indoor smoking areas, including Atlanta Hartsfield, Washington Dulles, Denver, Salt Lake City, Las Vegas McCarran, Nashville and Cincinnati/Northern Kentucky.

ANR is encouraging non-smokers to take a thumbs-down selfie outside an airport smoking lounges, smoking rooms, or anywhere people are spotted smoking cigarettes or e-cigarettes at airports and post it to Instagram, Twitter, Facebook, etc., with the hashtag: #SmokefreeAirports and the airport’s tag.

Selfies giving the thumbs-up to non-smoking airports are welcome as well.

As a reward, ANR is handing out these luggage tags, while supplies last.