Besides not smoking, what are scientifically justified steps one can take while young to reduce the risk of cancer?
https://www.epa.gov/radon/health-risk-radon
https://www.cancer.gov/about-cancer/causes-prevention/risk/s...
https://www.cdc.gov/nceh/radiation/brochure/profile_radon.ht...
Of course the best way to get Vitamin D is to be out in the sun... Your gut is pretty bad at absorbing it.