Because they cant handle the heat
Most of the China Marines were withdrawn in November 1941, but the North China Marines in Peking and Tientsin were scheduled to be withdrawn on December 10. (All weapons and ammunition except rifles and pistols had been crated and shipped by rail to the embarkation port.) However, Imperial Japan attacked the United States on December 7, and the Marine Embassy guards, plus a fourteen man Naval medical detachment, a total of 203 men, were captured and held as slave labor until the war's end in August 1945. A 204th man, a retired officer who had been living in Peking and recalled to duty, was immediately released. He continued living in Peking until he was included in the roundup of civilians and sent to the Weihsien civilian internment camp in March 1943. He was returned to the states on the exchange ship Teia Maru in Sep 1943. The last commander of the China Marines was Colonel William W. Ashurst

Measuring How Much Nicotine Is in a Cigarette If youve looked elsewhere for information about how much nicotine is in a cigarette before landing on this article, youve probably seen a fairly wide range of numbers
Overnight: Nicotine patch helps smooth cravings
Incapsula incident ID: 579000730153731649-489841453938446928
Nevertheless, how long cotinine, nicotine for that matter, depends on the way/method and how often you ingest it