Pack-year

（重定向自Packyears）

A pack-year is a quantification of cigarette smoking.

The pack-year is a unit for measuring the amount a person has smoked over a long period of time. It is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example, 1 pack-year is equal to smoking 20 cigarettes (1 pack) per day for 1 year, or 40 cigarettes per day for half a year, and so on.

单词	Packyears
释义	Packyears 英语百科 Pack-year （重定向自Packyears） A pack-year is a quantification of cigarette smoking. The pack-year is a unit for measuring the amount a person has smoked over a long period of time. It is calculated by multiplying the number of packs of cigarettes smoked per day by the number of years the person has smoked. For example, 1 pack-year is equal to smoking 20 cigarettes (1 pack) per day for 1 year, or 40 cigarettes per day for half a year, and so on.
随便看	lazy H antenna Lazy initialisation lazy initialisations Lazy initialization lazy initializations lazy intersection lazy in training lazyish lazyitis Lazy jack lazyjack lazy junction pacemaker Lazy Kate lazy leucocyte syndrome lazy leukocyte syndrome lazy line lazy list lazyload Lazy load lazyloaded Lazy loading lazyloading lazyloads lazy maize lazy painter