Smoking , which is linked to lung , mouth , stomach , pancreatic and bladder cancers , is the biggest avoidable risk factor , followed by alcohol and not eating enough fruits and vegetables . " of the 2 . 43 million deaths , 37 percent of them are from lung cancer , " said ezzati 報道說,吸煙這種不良嗜好與肺癌口腔癌胃癌胰腺癌以及膀胱癌等多種癌癥有關,是一項最為主要的可以避免的危險因素,其次是酗酒和不良飲食沒有攝入足夠的蔬菜和水果。