About l million Americans are diagnosed annually with skin cancer.Among those skin cancer patients，about 80 percent are with basal cell skin cancer,16 percent，with squamous cell skin cancer and 4 percent, with melanoma.the most serious form of skin cancers.Back to the interviewed patients，190 reported that they had used tanning devices at some time.In the control groups，only 75 had used such devices.Karagas said a statistical analysis shows that those who used tanning equipment were 2.5 times more likely to get squamous cell skin cancer than those who had not used the devices.For basal cell cancer.the risk was 1.5 times greater.

　　The risk was highest for those who first used the tanning devices before the age of 20，said Karagas.For this group，the squamous cell cancer risk was 3.6 times greater than that of the controls while the basal cell cancer risk was 1.3 times greater.

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