Unless you live in a cave, you are well aware that cigarettes cause lung cancer and tanning causes skin cancer. However, that doesn't stop people from smoking or baking in their bikinis on the beach. One main reason people continue to expose their skin to the sun without wearing any protection is that they want to have that nice healthy golden glow.
You should know that when your skin tans, it means there has been damage to your skin. Tanning is your body's way of trying to protect itself from further UV exposure and damage. In other words, tanned skin is damaged skin, and the darker the tan, the more damage that's been done. Think of all the tans you've had over your lifetime. It all adds up and can lead to skin cancer, wrinkles, and sun spots.
That's why it's critical that you wear sunscreen every time your skin is exposed to the sun. If you still want that kiss of a golden glow, fake it. Spray tans, self tanning lotions, and bronzers will give your skin that tanned look without the permanent damage.