Good God I found another Quote. Abdu'l-Baha believes that cancer is contagious, he also contradicts the aforementioned quote and states you can't become healthy from other healthy people. So much for his superhuman knowledge:
"… Thou hadst asked some questions; that why the blessed and spiritual souls, who are firm and steadfast, shun the company of degenerate persons. This is because, that just as the bodily diseases like consumption and cancer are contagious, likewise the spiritual diseases are also infectious. If a consumptive should associate with a thousand safe and healthy persons, the safety and health of these thousand persons would not affect the consumptive and would not cure him of his consumption. But when this consumptive associates with those thousand souls, in a short time the disease of consumption will infect a number of those healthy persons. This is a clear and self-evident question." (‘Abdu’l-Bahá: Tablet to an individual believer, October 1921: Star of the West, Vol. XII, No. 14, p. 233)
There is a well established link between tuberculosis (consumption) and lung cancer.
Briefly, it is assumed that TB is one of the risk factors for cancer. Numerous studies have been conducted in this regard throughout the world and it has been observed that there is a significant relationship between previous TB infection and lung cancer.
The Relationship between Tuberculosis and Lung Cancer