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Khat also known as Catha edulis, or qat is Yemens top cash crop, its cultivation the main livelihood for most of the 37% of the population working in agriculture, according to the U.N.s Food and Agriculture Organization

"I've been told by the people I know who make and sell the stuff that it's becoming quite popular with young people," says Griffiths, who became curious about snuff as a teenager after finding it referenced in a work by Charles Dickens

Many researchers also believe smoking may lower sperm count

By using MRI and PET brain scans, scientists can visualize the distribution and levels of the enzyme in the brain of the subjects