Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Smoking and Youth ?
    ### Response:
    Smoking cigarettes has many health risks for everyone. However, the younger you are when you start smoking, the more problems it can cause. People who start smoking before the age of 21 have the hardest time quitting. Teens who smoke are also more likely to use alcohol and illegal drugs.
    