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A substance potentially causing serious lung diseases has been found in liquid e-cigarettes sold here, health authorities said, Thursday. The "vaping" products, however, did not contain tetrahydrocannabinol (THC), a chemical that is said to be responsible for most cases of lung damage from vaping reported in the U.S. The Ministry of Food and Drug Safety announced the results of its toxicity tests on seven potentially harmful ingredients in 153 liquid e-cigarette products, or e-liquids, amid growing anxiety among vapers following the health authorities' strong warning against using them issued in October.