Can you elaborate? As far as I know, abstinence from smoking and drinking as well as maintaining a healthy weight have long been the most important factors in cancer prevention. I don't think that's controversial, but that doesn't make them easy obviously.
You'd be surprised. There are unfortunately many people who will aggressively attack anyone suggesting diet, exercise or weight management in any way to address obesity-related diseases. In their worldview, people have no agency to change their eating habits, and advising patients to do so is unhelpful, they exclusively want drugs, surgery or other accommodations to address issues.
Is an active lifestyle easy? Well, it is easy if you like being active, and extremely hard if you hate it.
Weather, proximity to parks/recreational areas, convenient public transit, and dense neighborhoods can contribute to increasing physical activity without someone actually wanting to "like being active".
There are local/regional/national differences in physical activity and health that are not merely explained by personal preference.
It's more of a prioritisation thing e.g. some people will live in New York even though they hate it because they get paid well there.
Or they'll live in Arizona because family is there.