So far, there is no scientific evidence in the world to directly prove that cancer can spread through daily life such as kissing, touching, sex and using tableware. Our body's immune system is very sophisticated, it can recognize the body's own cells, and attack and destroy foreign invasive viruses and bacteria.
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For healthy people, even if they are exposed to a certain number of cancer cells, it is no problem, because the human immune system will quickly remove all the cancer cells that have been exposed.
Many cancers are related to viral or bacterial infections. Cervical cancer is related to human papillomavirus infection, nasopharyngeal cancer is related to EB virus, liver cancer is related to hepatitis B virus, and gastric cancer is related to Helicobacter pylori. These viruses and bacteria can spread in the process of human contact in daily life, but it is not certain that individuals infected with these viruses or bacteria will get related cancer.
People's Daily Online-Commentary: Is cancer really contagious?