Yes, it does take some effort on your part if you wish to be come independent and prepared.
As for cancer, it can be easily prevented as it is a disease caused by deficiency in an essential compound (vitamin B-17) which most people do not ingest. More info: https://monero.town/post/1263720
Just like the disease scurvy was just a simple deficiency in vitamin C but the experts were baffled for hundreds of years even though the solution was already known by many people.