YOU SAID:

Cigarette smoking, hereafter referred to as “smoking,” is the largest single risk factor for premature death in developed countries

INTO JAPANESE

先進国での早すぎる死のため、最大危険因子でありタバコを吸う、「喫煙」といいます

BACK INTO ENGLISH

Cigarette smoking and in maximum risk factors for premature death in the developed countries, referred to as "smoke"

INTO JAPANESE

「煙」と呼ばれるタバコ喫煙と先進国での早すぎる死の最大の危険因子で

BACK INTO ENGLISH

The biggest risk factor's untimely death in cigarette smoking is called "smoke" and developed countries