Maybe the Coincidence cause of sniffing and coughing is a real one .
People see others making these strange upper body signals and they unconsciously mimic them .Our primate brain response system .
Considerable benefits seem likely if people wore ear plugs and dark glasses .
Feel sure that coughing and sneezing could be reduced by around 80% .
Of course there will still be a few attention seekers who will try to impress with their dirty habits .
Punish them . Harshly .
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