The number of words in the composition that the little girl advised grandpa to smoke was 150.

Everyone knows that smoking is harmful to health. But when it comes to quitting smoking, it's not that easy, and so is my grandfather. It is really difficult to persuade him to give up smoking. Grandpa: A cigarette after dinner is a living fairy! Serena: Grandpa, why do you cough so badly? Grandpa: It doesn't matter if you are old and have a bad trachea. Serena: Grandpa, I saw this news yesterday. Scientists did an experiment: an active puppy was injected with a drop of nicotine intravenously, and it soon died. Grandpa, what is nicotine? Grandpa: Nicotine is an odorous, bitter, colorless and transparent oily liquid. The main components of cigarettes. Serena: Grandpa, is nicotine poisonous? Is it harmful to human body? Grandpa: It's toxic, of course it's harmful to your health. Grandpa, do you love me and my father? Grandpa: Silly boy, as the saying goes, my old son, grandson and grandpa are the lifeblood. How can I not love them? Grandpa, does dad love you? Grandpa: Your father is very filial and respectful to me. He thinks of everything for me. He loves me very much. Grandpa, I love you, too! When I heard your cough when you smoked, my heart followed closely and I felt uncomfortable. Grandpa: My good grandson, when you grow up, you are sensible and will care about others. Serena: Grandpa, you are eighty years old this year. Your health affects the hearts of the whole family. We hope grandpa will be a centenarian! Grandpa: I just cough when I smoke. Look at my legs, feet and spirit. Grandpa is still very tough. Grandpa, nicotine in cigarettes is poisonous. It is very harmful, not only to smokers, but also to passive smokers. Grandpa, will you quit smoking for the sake of the people who love you and the people you love? Grandpa: This boy, what you said is reasonable. I quit smoking today, and my grandson is in charge of supervising me. I finally won my grandfather's struggle to quit smoking. Smoking is harmful to health. I hope all people can quit smoking for the people they love and the people who love you.