According to statistics, children of families with parents smoking more than ten a day are shorter by 0.65 cm on average than children of non-smokers; and children of families with parents smoking less than ten a day are 0.45 cm shorter by average than children of non-smokers. It can be inferred from this:. ["children's passive smoking will affect the growth and development of the body.", "children's height depends on whether parents have a smoking habit.", 'Parents who smoke more severely, lack of sufficient care for their children, which seriously affects their growth.', 'smoking by parents will give children a demonstration role, and children secretly smoke, which will affect the growth.']