For many youngsters, smoking might seem a cool thing to do. They might pick up the habit due to peer pressure and the need to fit in. As they become addicted, they might feel that it is their only way to unwind and overcome their problems.

    However, smoking is a bad and even dangerous habit. It may cause a variety of diseases, not only respiratory but also pulmonary. It also increases the risk of other diseases such as cancers of the throat, mouth, nasal cavity, oesophagus, stomach, pancreas, kidney, bladder, and cervix, as well as acute myeloid leukaemia and erectile dysfunction.

    Smoking not only affects physical health but also mental health. When a smoker feels anxious, he or she might smoke to get rid of the anxiety, which may increase the risk of anxiety symptoms in the long run. Although people have claimed that nicotine in cigarettes can improve attention and concentration, it is short-lived and cannot justify the habit.

    From the reasons above, we can conclude that smoking is a bad habit that should be avoided.

What is the main idea of the second paragraph?