求翻译：大多数人都知道吸烟能致命，他们也明白吸烟能造成心脏病、中风、上呼吸道感染、肺癌，但是不知道吸烟如何能引起这些致命的病呢?br> 从现代科学家的研究中已经完全得到了证实。是什么意思？

Most people know that smoking can be deadly, they also understand that smoking can cause heart disease, stroke, upper respiratory tract infections, lung cancer, but do not know how smoking can cause the fatal disease it? Br> from the study of modern scientists has been fully confirmed.

Most people know that smoking can be lethal, and they fully understand that smoking can cause heart disease, stroke, and upper respiratory tract infection, lung cancer, but do not know that smoking can cause these deadly diseases? br> from modern scientists in the study had been fully confirmed.

The majority people all knew smoking can be fatal, they also understood smoking can create heart disease, the stroke, the upper respiratory tract infection, the lung cancer, but did not know how smokes can cause these fatal sickness? br> already completely obtained the confirmation from in the mo

Most people know that smoking can be lethal, they also understand that smoking can cause upper respiratory infections, heart disease, stroke, lung cancer, but do not know how smoking can cause these deadly diseases? BR> in the study of modern scientists have completely confirmed.