Why are sexual transmitted diseases serious?

Ihave a really high metabolism and only weigh 70 pounds (13 almost 14). people always ask me two questions: do you ever eat and how do you eat so much and stay so skinny. i am worried that a high metabolism wont me forever. what are some safe steps i can take to maintain being fit. (also, i already work out i am a dancer so i get cardio a lot)

Ingredients used in tobacco products been banned?

When writing fitness goals we encourage using the smart method. what does s-m-a-r-t stand for? use full sentences to explain what each letter stands for in their goals setting process.