answer:Tanning beds are health risks because of ultraviolet (uv) radiation, which is definitely ionizing. This means the photons have enough energy to break chemical bonds in skin molecules. If this happens to DNA then it could cause cancer by mutation. This is way worse than cell phones, which emit high radio-frequency / low micro-wave photons that have no apparent effect other than to slightly heat the tissue. Ionizing radiation is known to damage tissue and cause cancer. Today’s report says that closely-held mobile phones slight increases brain cell activity, which might somehow lead to cancer, though they emphasize there’s no actual evidence of a link.