Bill Wilson died January 24, 1971, of emphysema and pneumonia.

And Bill W. did eventually die from that "okay" vice — from emphysema and pneumonia — desperately, futilely gasping for another breath from an oxygen mask. He didn't quit smoking until it was far too late for him, and tobacco had destroyed his lungs.
Score another victory for the Addiction Monster.

Francis Hartigan, Lois Wilson's private secretary, wrote:


By the time Ebby Thacher died in 1966, a victim of emphysema, Bill had been trying to quit smoking for more than twenty years. He'd also known since the early sixties that he had emphysema himself. Smoking had begun to impair his health in the 1940s, in the form of frequent colds and chronic bronchitis, and his breathing was noticeably labored from the mid-1960s onward. Yet even when his breathing became so problematic that he needed frequent doses of oxygen to get through the day, he smoked.
A number of visitors to Stepping Stones during Bill's last years report witnessing scenes in which Bill would be trying to decide whether to have more oxygen or another cigarette. Inevitably, the cigarette won out. Bill was thought to have finally quit smoking early in 1969, by which time his bouts with bronchitis had become struggles with pneumonia, but several people confirm that he was still smoking even after most everyone thought he had quit. He hid cigarettes in his car, and for as long as he was still well enough to drive, he smoked.
It seems beyond comprehension, but the evidence is inescapable. ... [Bill Wilson] literally smoked himself to death.
Bill W., A Biography of Alcoholics Anonymous Co-Founder Bill Wilson, Francis Hartigan, page 208.
Bill Wilson didn't bother to print a retraction, to warn his fellow A.A. members about tobacco, when he found out that he was dying. Bill was far too egotistical to admit that he had been wrong.

Bill Wilson died January 24, 1971, of emphysema and pneumonia.

In addition, there is now a lot of evidence that smoking makes all cancers worse, even if tobacco didn't cause the cancer in the first place. Tobacco smoke contains something like 50 different carcinogenic chemicals, and just the restriction of blood flow in the capillaries that tobacco causes makes it harder for the body to get blood with white blood cells and antibodies to the cancer, to attack and kill the cancer. Tobacco also cripples the immune system, which would also like to kill the cancer.

Doctor Bob died of prostate cancer, while puffing on those cigarettes to the bitter end.

Score another victory for the Addiction Monster.