We all love and wear nail polish. (Well, most of us.)
Many nail polish have chemicals. Lots of them, actually. That's why when the nail polish you've used rubs off, wait a little before putting more on. This is because when you put nail polish on, your nail pores can't breathe. (Yes, your nails have pores!!!) Therefore, when it comes off, your nails scream, "Aahh." I usually wait 3 - 4 days before applying another coat. Sometimes i don't put any on for months!
Natural nail polish is a different story. Their much, much better than regular nail polish. You can find them at stores like Whole Foods. Research places that sell natural polish in your area, or ask your local store manager if they carry any.
Zoya carries non-toxic nail polish. Go to www.zoya.com.
Tip: Some girls suck their fingers just because, or sometimes they do it after eating food and their fingers are messy. If you know you have this habit, I don't recommend nail polish for you, natural or not!