You've heard it before: Alcohol, smoking, drugs, and unprotected sex can be bad for you. And it's true. But these things are even more dangerous when you have diabetes. You've been working hard to stay healthy. Alcohol, cigarettes, and drugs just mess that up. Unprotected sex can lead to sexually transmitted infections (STIs) and unplanned pregnancy. Unplanned pregnancy can be very risky if you have diabetes. High blood sugar can harm an unborn baby. If you feel pressure to drink, smoke, do drugs, or have sex, talk to your diabetes team or your parents to get advice.