It's hard to measure your risk, since risk depends on lots of things besides tanning booths--heredity, sun exposure as a child, skin type, and so forth. I think you've done yourself a service by giving up tanning for the artificial kind. Your best bet is to see a dermatologist to see where you stand. It might be a good idea to get your skin checked with some regularity after that, though the skin doctor can tell you whether that would be needed every year or not.
Take care. Don't grump.