Tại sao khó bỏ thuốc lá?
"Nếu bạn không còn cảm giác thèm nicotin thì bạn cũng chưa thể tuyên bố mình đã bỏ thuốc thành công, cuộc chiến vẫn còn ở trước mắt", các nhà nghiên cứu ĐH Pittsburgh và ĐH Carnegie Mellon cho biết...
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