Chewing tobacco has many benefits. However, the primary benefits occur in the area of mental health. The habit originates in a search for contentment. The life expectancy of our people has increased greatly in recent years; it is possible that the relaxation and contentment and enjoyment produced by tobacco chewing has lengthened many lives. Hence, Chewing Tobacco is beneficial. Which of the following, if true, would weaken the conclusion?
There is as yet no statistical evidence to prove a link between chewing and longevity.