Marc Lalonde was Correct in 1975, and Remains Correct.
When Marc Lalonde published the "Health Field Effect" for Canada's Ministry of Health in 1975 he discussed how most disease was related to our environment, including our behaviors. In an article published in Lancet today the authors state that "advances in cancer treatment have not been as effective as those for other chronic diseases; effective screening methods are available for only a few cancers. Primary prevention through lifestyle and environmental interventions remains the main way to reduce the burden of cancers." Also they state that "Smoking, alcohol use, and low fruit and vegetable intake were the leading risk factors for death from cancer worldwide and in low-and-middle-income countries. In high-income countries, smoking, alcohol use, and overweight and obesity were the most important causes of cancer. Sexual transmission of human papilloma virus is a leading risk factor for cervical cancer in women in low-and-middle-income countries."
Clearly we have to improve our counseling and behavioral modification methods without becoming Orwell's Ministry of Health Police.