As we all know, smoking does great harm to human beings. Smoking causes many illnesses. A lot of people always cough(咳嗽)because of smoking. One of the most serious illnesses caused by smoking is lung cancer(肺癌). Many people died because of smoking. According to the newest study, there are other three things as deadly as smoking.

    Loneliness(孤独). The growth of using Internet and less person to person communication make people feel lonely. Vivek Murthy, has made loneliness a worldwide epidemic(流行病)and it could be deadly. Julianne Holt has found that loneliness reduces(减少)people's life which equals to(等于)smoke 15 cigarettes a day.

    Sitting. Sitting all day increases(增加)the risk of different kinds of cancers. Researchers surveyed about four million people. They kept on①______ down their everyday sitting time. Such as how often they sat to watch TV, do work, and so on. According to the data(数据), they find that if you spend a two-hour time sitting②______ moving, the risks of getting ill will be higher. Even though they still exercise during the day, it won't change the result.

    Poor diet(饮食). Nowadays many people go on a poor diet to keep thin and fashion. They usually have a little fruit or just a cup of water instead of the meal. Going on a poor diet for a long time is not healthy for us. We can't live a normal life without a healthy body.The poor diet is becoming one of the important reasons of death just like smoking.

    In order to keep healthy, we should get rid of these bad habits.