There is a long-lasting study (more than 10 years) on a huge French cohort (more than 100k) that proves exactly the opposite : people who eat mostly organic food have less cancer and several other diseases. This is straight disinformation.
Results Among 68 946 participants (78.0% female; mean [SD] age at baseline, 44.2 [14.5] years), 1340 first incident cancer cases were identified during follow-up, with the most prevalent being 459 breast cancers, 180 prostate cancers, 135 skin cancers, 99 colorectal cancers, 47 non-Hodgkin lymphomas, and 15 other lymphomas. High organic food scores were inversely associated with the overall risk of cancer (hazard ratio for quartile 4 vs quartile 1, 0.75; 95% CI, 0.63-0.88; P for trend = .001; absolute risk reduction, 0.6%; hazard ratio for a 5-point increase, 0.92; 95% CI, 0.88-0.96).
Conclusions and Relevance A higher frequency of organic food consumption was associated with a reduced risk of cancer. If these findings are confirmed, further research is necessary to determine the underlying factors involved in this association.
So rich people who can afford expensive food get cancer less often.
But at the same time I don't think its healthy to _always_ question everything in the mainstream. Its mainstream for a reason (sometimes an angle pushed by economic groups like big cig in the example above), and sometimes the reason is reasonable. Be critical and keep an open mind, but don't assume its fake because its mainstream.