NHS choices
And while contesting the evidence that smoking caused disease and that nicotine was the addictive drug in cigarettes, the cigarette companies secretly accepted these facts since the 1950s (cancer) and 1960s (addiction)
The camera allows the doctor to see damage to the esophagus, how severe the GERD is, and to rule out serious complications of GERD or unexpected diseases
Damaged cells begin to divide uncontrollably, and over time, this leads to the formation of malignant tumours
The health consequences of smoking: 50 Years of Progress 2014 Surgeon Generals report suggested that there is sufficient evidence to infer a causal relationship between smoking and cancers of the lung, larynx, oral cavity, pharynx, esophagus, pancreas, stomach, bladder, kidney, cervix, and acute myeloid leukemia