Adult pacifiers which claim to relieve anxiety and improve sleep have become a trending product in China, sparking concerns from doctors and internet users.
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Some online shops claim they sell more than 2,000 such items a month.
They are described as being bigger than the baby version and sell for between 10 and 500 yuan (US$1.4 and US$70), the news outlet The Cover reported.
Many shops say that adult pacifiers offer stress relief and help with sleep.
Some say the products can also help people quit smoking and assist with proper breathing.
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