If you wish to vape or smoke cigarettes, you must visit one of the 10 designated outdoor smoking areas. These areas are clearly marked with signage on the ground and the columns. They can be found on all levels of Terminal 1 and 3.
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In that case, you'll have to take your bags out of the airport and go to an outdoor smoking area. When you return to the airport, you'll have to go through the security checkpoint again. Note that leaving an airport to smoke will be especially inconvenient if you have a layover in a foreign country.
The vast majority of airports don't allow smoking indoors whatsoever but have designated smoking sections outside. Those can vary from anywhere outside to only in specific places outdoors. American Nonsmokers' Right Foundation maintains and regularly updates a list of these airports.
Los Angeles International Airport (LAX) – Completely smokefree indoors and e-cigarette use is not permitted indoors. Smoking is permitted in three outdoor smoking areas located past security gates at the Tom Bradley International Terminal, Terminal 2, and Terminal 7.