This is the source headline, but from their own article<p><i>Cigarettes have long been a cause of cancer, and remained in the top spot — about 19% of cancer cases included were attributable to smoking. Excess body weight was deemed a cause for about 7.6% of cases, including malignancies of the gallbladder, esophagus, liver and kidneys.<p>Related: By the numbers: America’s alcohol-related health problems are rising fast
Alcohol came in third, with 5% of cases in men and women over 30 attributable to drinking</i><p>This is the actual source: <a href="https://acsjournals.onlinelibrary.wiley.com/doi/full/10.3322/caac.21858" rel="nofollow">https://acsjournals.onlinelibrary.wiley.com/doi/full/10.3322...</a><p>Further,
<i>The proportion of all cancers attributable to dietary factors ranged from 0.3% for low dietary calcium consumption to 1.4% for low fruit and vegetable consumption (Figure 1). By cancer type, the proportion of colorectal cancer cases attributable to dietary factors ranged from 4.2% (6090 cases) for low dietary calcium, to 7.3% (10,610) for red meat, to 10.5% (15,150) for low dietary fiber, and to 12.8% (18,540) for processed meat consumption</i><p>The study seems to indicate UV light exposure (not wearing sunscreen) as a very large preventable factor, too.