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four cigarettes a day 4 Each cigarette reduces 20 minutes of life Smoking One to Four Cigarettes
Description
The 13 proposed warning labels focus on lesser-known risks associated with smoking, such as erectile dysfunction, bladder cancer and cataracts

We used the chi-square test for categorised variables

Wikipedia , Denny, Walter

There's a debate over whether fertility rates have fallen, and many people have blamed chemicals known as endocrine disruptors in cans, bottles and in water supplies
However, in a large meta-analysis of 26 studies, data showed smokers of lower-tar-yield cigarettes having a lower risk than smokers of higher-tar-yield cigarettes
