William Richard Shaboe Doll became an English epidemiologist who became one of the first researchers to hyperlink cigarette smoking to lung cancer, as posted withinside the British Medical Journal in 1950. In the identical journal, fifty years later, Doll posted (22 Jun 2004) the primary studies that quantified the harm over the life of a generation, primarily based totally on a 50-12 months have a look at of a set of virtually 35,000 British medical doctors who smoked. The have a look at determined that nearly 1/2 of of continual cigarette people who smoke had been killed via way of means of their habit, and 1 / 4 died earlier than age 70. Persons who cease via way of means of age 30 had ordinary lifestyles expectancy. Even quitting at age 50 stored six extra years of lifestyles over folks who persevered smoking. He studied different fitness effects, consisting of the ones because of asbestos and electromagnetic fields.