The report authors also looked at other cancers such as prostate cancer and concluded that smoking is not a cause for this type of cancer, although it increases risks of dying for those diagnosed with prostate cancer.
Examining breast cancer, the researchers concluded the evidence suggests smoking can cause the disease.
"Even a finding that is 'suggestive,' is a pretty strong finding," Glantz told LiveScience. "If I give a glass filled with clear liquid and say, this might give you breast cancer but I'm not absolutely positive, I don't think you want to drink the liquid."
Other new entries in the official list of smoking-caused diseases include Type 2 diabetes, rheumatoid arthritis, erectile dysfunction, macular degeneration that can blind older people, and cleft palate birth defects.