Ubufakazi bokuqhuma kwe-Shenhai
3,4-I-Benzopyrene ekhona kwitiyela yamalahle ibonakala njenge-carcinogen enkulu.
Le nto idlangile emithonjeni ehlukahlukene, kuhlanganise nentuthu evela ezimbonini, intuthu kagwayi, ukukhishwa kwemoto, nasenyameni ebhenywayo ekhiqizwa ngesikhathi sokosa.