You can eat lots of fruit and vegetable every day and exercise regularly,but your health is still
in great danger if you smoke.We know t___smoking is bad for us,but not everyone gives it e___ attention.Here we have some serious facts about smoling.In the US,smoking c___ 20% of the death,killing more than 400,000 people each year.Smoking reduces life expectancy by 7 to 8 years.Each cigarette shoutens a smoker's life by about 5 m____.90% of lung cancer cases are due to smoking.Almost 1 in 5 heavy smokers will d___ of lung cancer