When life gets overwhelming, some adults are turning to an unexpected stress reliever: pacifiers. The trend is booming in China, where young professionals are swapping out melatonin, meditation apps, and even cigarettes for adult-sized binkies. On e-commerce platforms like Taobao and JD.com, sales are skyrocketing, with prices ranging from $1.40 to $70. Sellers market them as sleep aids, stress relievers,...