<human>: I recently found out that one of my close friends, who I've known since childhood, has been using tanning beds. She is a smart girl other than this one vice, but I don't understand how she could be so stupid to do this to herself.

I tried to talk to her about it when she was visiting me at school this weekend, but she refuses to listen. I gave up because I didn't want to ruin our weekend, but now I feel like I need to help her.

Here are the reasons why she says she doesn't want to stop:

* She "only" goes twice a week for 12 minutes
* No one in her family has ever had skin cancer, so she won't get skin cancer
* It's the only time during her (admittedly very busy) week that she gets to nap and relax
* It's "not a big deal"

I don't know what to do. She is so smart but is acting so mind-numbingly stupid. One of our acquaintances from high school recently was treated for melanoma that was a result of using tanning beds - how does she not realize that this could happen to her?

I need advice on how to continue to broach this subject with her. She was very defensive when we briefly discussed it this weekend, and I don't want her to feel like I am attacking her. I think this all stems from her lack of self-confidence, so she feels like the tanning makes her more beautiful, but it's just destroying her body. I know she's an adult and can make her own choices, but I can't let her give herself cancer anymore. How can I help her?

Can you provide a brief overview of the text?
<bot>: My friend won't stop using tanning beds and I am very concerned about her health - how can I help her without making her feel like I'm attacking her?