"For most of the 19th century, there was less concern about the perils of taking cocaine than there was about the negative side effects of drinking green tea," says author Matthew Sweet. The backlash against green tea was caused by a mix of baseless fears (that it triggered hysteria and insomnia) and genuine concerns about it being toxic as a result of widespread adulteration. McKay Savage/Flickr hide caption

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In the Blue Zone of Okinawa, Japan, locals drink green tea with jasmine flowers and turmeric called shan-pien, which translates to "tea with a bit of scent." David McLain/Courtesy of Blue Zones hide caption

itoggle caption David McLain/Courtesy of Blue Zones

Japanese women drink green tea during an outdoor tea ceremony in Kobe, Japan. Making the brew a daily habit may be protective against stroke. Buddhika Weerasinghe/Getty Images hide caption

itoggle caption Buddhika Weerasinghe/Getty Images