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One of the health defects that pregnant women may experience if they smoke during pregnancy is difficulty in breathing

Berkeleys data doesn't have Beijing-specific averages, but their weighted average for all of China of 52 micrograms per cubic meter is roughly in line with Greenpeaces overall averages of 66 (they actually measured slightly different periods of time and used different data collection methodologies).So let's accept Greenpeace's Beijing numbers as gospel

Thereafter, the rate of increase reduced, leading to an estimated weight increase of about 4-5 kg at one year after cessation

Impact of the WHO FCTC over the first decade: A global evidence review prepared for the Impact Assessment Expert Group