What are the risks of using birth control when you are 14 years old?

If a 14 year old takes Birth Control it could lead her to be sexually active at her young age and she may not think she needs other form of protection. Remember that birth control does not prevent STD's. Also, nothing is 100% effective in preventing pregnancy. Birth control is 98-99% effective if you take it everyday at the same time and do not smoke. (I got pregnant on birth control and took it everyday at the same time and I do not smoke) So if you take it at different times, or miss a pill and you smoke it is less effective.