ments ▁such ▁as ▁em phys ema , ▁bron ch itis , ▁and ▁ast h ma . ▁Specifically , ▁meta - anal ys es ▁show ▁that ▁lif el ong ▁non - sm ok ers ▁with ▁partners ▁who ▁smoke ▁in ▁the ▁home ▁have ▁a ▁ 2 0 – 3 0 % ▁greater ▁risk ▁of ▁lung ▁cancer ▁than ▁non - sm ok ers ▁who ▁live ▁with ▁non - sm ok ers . ▁Non - sm ok ers ▁exposed ▁to ▁cig aret te ▁smoke ▁in ▁the ▁work place ▁have ▁an ▁increased ▁lung ▁cancer ▁risk ▁of ▁ 1 6 – 1 9 %. ▁ ▁A ▁study ▁issued ▁in ▁ 2 0 0 2 ▁by ▁the ▁International ▁Agency ▁for ▁Research ▁on ▁Can cer ▁of ▁the ▁World ▁Health ▁Organ ization ▁concluded ▁that ▁non - sm ok ers ▁are ▁exposed ▁to ▁the ▁same ▁car cin og ens ▁on ▁account ▁of ▁to b acco ▁smoke ▁as ▁active ▁sm ok ers . ▁Sid est ream ▁smoke ▁contains ▁ 6 9 ▁known ▁car cin og ens , ▁particularly ▁ben z opy rene ▁and ▁other ▁pol yn uc lear ▁a rom atic ▁hydro car b ons , ▁and ▁radio active ▁decay ▁products , ▁such ▁as ▁pol on ium - 2 1 0 . ▁Several ▁well - est ab lished ▁car cin og ens ▁have ▁been ▁shown ▁by ▁the ▁to b acco ▁companies ' ▁own ▁research ▁to ▁be ▁present ▁at ▁higher ▁concentr ations ▁in ▁second - hand ▁smoke ▁than ▁in ▁main stream ▁smoke . ▁ ▁Scient ific ▁organis ations ▁confirm ing ▁the ▁effects ▁of ▁second -