Some restaurants in China lace their food with opiates to keep customers coming back 

A restaurant owner there just confessed to police that to keep customers coming back, he had infused his noodles with 2 kilograms (4.4 pounds) of pulverized poppy buds—which can contain narcotics like morphine and codeine—

The restaurant boss said customer numbers leapt after he started using his “special” seasoning. Chinese authorities say doses were enough to addict frequent diners. The shop owner, wasn’t the first Chinese restaurateur to strike upon this idea—not by a long shot. An investigative report in 2011 found that illegal poppy products are available in Shaanxi markets—with restaurant owners being the prime customers.