Ngokocwaningo olwenziwa yi-US National Academy of Sciences, ukuchayeka kugwayi we-e kuyanda...
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ISAYENSI: Ukuchayeka kancane ku-e-cigarettes kungase kube nomthelela ku-asthmatics
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UCWANINGO: Ngokusho kwe-CDC, umfundi oyedwa kwabane wasekolishi uthintwa wukushunqa umoya.
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