Meizial khu hipchhawn (passive smoking/secondhand smoke) hian hmeichhia-ah hnute cancer a awmtir thei niin West Virginia University Dr Juhua Luo-a kaihhruai U.S. mithiam rual chuan an ring.
Mithiam rualte hian hmeichhia 80,000 an zirchianah, naupang leh puitlingah meizial khu hipchhawn hian hnute cancer a awmtir thei niin an hria. Amaherawhchu, he thil hi zirchian leh deuh phawt hnu-ah, a awmtir thei ngei a ni tih nemngheh tak tak chauh tur niin zirchiangtute hian an sawi.
Khawvel mitthi mi za-a pakhat (1% ) chu meizial zute atanga chhuak meikhu hipchhawngtute ( second-hand smokers / passive smokers ) an ni a, kum tinin meizial khu hipchhawn avangin mi 600,000 an thi thin, niin Khawvel Pum Hriselna Lam Buaipui Pawl ( WHO –World Health Organization ) zirchianna(26 November 2010) chuan a tarlang.