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Dustin DiamondThe diagnosis of cancer has been difficult for him to deal with emotionally … and he wonders how it happened to him.
The representative of the “Saved by the Bell” star told TMZ … Dustin is struggling to accept the type of lung cancer he has – stage 4 small cell carcinoma – because it is usually caused by smoking, and he was never a smoker.
So, we were told that Dustin can’t help wondering if his cancer is the result of his frequent work trips over the past 20 years.

The representative says that Dustin worked across the country on film sets and comedy clubs for meetings and greetings … and sometimes had to stay in hotels and motels that were quite questionable, because there were no other options.
They said that Dustin believes that some of these stains may have mold or asbestos … that he may have breathed, causing his cancer.
As we reported … Dustin just completed his first round of chemo in a Florida hospital, and will begin physical therapy soon, pending the second round of treatment.
We were told that his doctors did not determine what caused his cancer, but, as we reported … he has a history of this in his family. His mother died of breast cancer.
Dustin’s representative says he is awaiting further test results and hoping to get some answers.