Boston-bound Yongda Huang Harris, 28, was arrested at Los Angeles Airport on suspicion of transporting hazardous materials on a flight from Japan.
Harris, a US citizen who works in the Far East, faces up to five years in prison if convicted.
US Customs and Border Protection officers became suspicious when they noticed he was wearing a bulletproof vest and flame-retardant trousers under his trenchcoat.
They called in Homeland Security special agents who carried out a search of his luggage.
They found numerous suspicious items including knives, body bags, a hatchet, a collapsible button, a biohazard sit, a full-face respirator, billy clubs, handcuffs, leg irons and a device to repel dogs.
The smoke grenade was later X-rayed by the Los Angeles Police Department's bomb squad.
"Depending on the conditions when it is ignited, the smoke grenade, made by Commando Manufactures, could potentially fill the cabin of a commercial airplane with smoke or cause a fire," federal officials said in a press release.

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