Cancer cells in our Body?

The Internet is recently flooded with a medical claim that is scaring the public. The statement that says “normally, we all have dormant cancer cells in our body.” Implied is the assertion that all healthy people are walking around with a time bomb within them, ready to explode. If every tissue in the body of a normal person is biopsied, or if a person who dies of any non-cancerous disease, like heart attack or stroke, or trauma, is autopsied from head to foot, no cancer cells will be found. The only exception to this is if the person had an undiagnosed cancer, which is incidentally found on autopsy, a finding that excludes this person from being healthy in the first place. Therefore, all healthy individuals, from birth to adulthood to their death, do not normally carry, or have, any cancer cells in their body, unless they develop a malignancy. If they abuse themselves and subject their body to carcinogens, substances or toxins that cause cancers, then the tissues of the organs involved (like the lungs among smokers, the esophagus or food pipe, and the liver, among alcoholics) could be so irritated and damaged by the toxic agent for the cells of those tissues to change into cancer cells.