The Food and Drug Administration should move aggressively to implement and then strengthen its proposed cancer warnings about tanning beds.

A stunning 20 million to 30 million Americans each year use tanning beds. Use is particularly concentrated among young white women. The Centers for Disease Control and Prevention estimated that about 30 percent of white women between the ages of 18 and 25 used an indoor tanning machine in 2010. And about 60 percent of that group did so at least 10 times during the year.

The ultraviolet radiation from indoor tanning far exceeds that of the natural sun. Studies suggest that people who use indoor tanning before age 35 increase their risk of melanoma (the most serious type of skin cancer) by about 75 percent. Similarly, the National Cancer Institute estimates that women who use indoor tanning at least once a month are 55 percent more likely to develop melanoma.

The Indoor Tanning Association, an industry lobbying group, has claimed that indoor tanning is safer than exposure to natural sunlight. But the Federal Trade Commission has found those claims to be false, and forced the association to stop making them.

So what can we do?

First, if you've used indoor tanning beds extensively, get a melanoma screening. Such screening may not make sense for the general population, but it does for those at high risk, which includes people who have used indoor tanning a lot.

Second, pediatricians and other doctors could be even more forceful in warning about the risks for young people.

Third, more states should consider banning indoor tanning for those younger than 18. At the very least, all states should ban indoor tanning for minors without permission from parents, as New Jersey has done.

Fourth, in the Affordable Care Act, the Obama administration imposed a 10 percent excise tax on indoor tanning services to help pay for expanded health insurance coverage. The inspector general at the Treasury Department, however, reported in 2011 that the tax was being collected from less than half of the expected number of tanning facilities.

Treasury should more aggressively collect this tax, and Congress should consider raising it to 25 percent or even 50 percent.

Finally, in May, the FDA proposed tighter regulatory oversight of tanning beds along with new warnings about cancer risks. This is welcome, but not enough: The proposed warnings, for example, would be placed on promotional materials and websites, rather than the machines themselves. The FDA should finish its regulations quickly, and then follow up with even tighter standards if these relatively weak warnings don't do much to discourage use.

Peter Orszag is vice chairman of corporate and investment banking at Citigroup.