阅读短文，并按照题目要求用英语回答问题。
         Born in 1949，Diana Nyad took an early interest in swimming as a sport and was a Florida State High School swimming champion. Like many young athletes，she had Olympic dreams，but a serious illness kept her from competing in the Games. The disappointment didnˈt stop her from going forward. Instead，she became interested in marathon swimming. A brilliant athlete，she was well­conditioned for spending long periods of time in the water. As a long­distance swimmer，she would compete against herself and the obstacles presented by distance，danger，cold，and exhaustion.
         For ten years Nyad devoted herself to becoming one of the worldˈs best long­distance swimmers. In 1970，she swam a ten­mile marathon in Lake Ontario，setting the womenˈs record for the course.In 1972 she set another record by swimming 102.5 miles from an island in the Bahamas to the coast of Florida. Then she broke a third record when swimming around Manhattan Island in 1975.
         Nyad attempted to swim the distance between Florida and Cuba in 1978.Though the span of water is less than 100 miles wide，it is rough and dangerous. After battling the water for two days，she had to give up for the sake of her own health and safety. Even so，she impressed the world with her courage and strong desire to succeed. For Nyad her strength of purpose was just as important as reaching Cuba. That is how she defined success. It did not matter that her swim came up short；she believed she had touched the other shore.
         When Nyad ended her career as a swimmer，she continued to try new things — travelling the world as a reporter，writing books and giving public speeches about her life. Diana Nyad works to inspire others，just as she did when she swam the waters of the world.

When Dr. Adnan Khera starts dancing on the streets of Bostion, he’s not only doing it for charity, but also to hopefully make himself a better doctor. Since the beginning of May, the anesthesisology resident (麻醉科住院医师) at Tufts Medical Center has been dancing around the city while dressed as a doctor.

  All donations he gets during his performances are donated to a variety of charities, from animal rescue to child poverty, through his Doctor Be Dancing organization. Khera, 28, has raised about $5,000 so far and hopes to bring in $10,000 by October.

  “One of the missions of this project is to show the value of individuality inside of medicine to medicine as a whole,” Khera said. “What I do on th streets allows me to communicate with the population at large. While I feel like normally in medicine, we have trouble communicating with patients. We fail in a lot of senses to communicate with them and show what it’s like to be a doctor and that what is best for the patients. By expressing our individuality, we can better communicate with our patients.”

  Khera is no stranger to public performances, having previously done stand-up comedy(单人滑稽喜剧表演) and public speaking. He is also a runner, so dancing is another way for him to stay fit in busy work. He tries to go out about twice a week in Boston, and also has done performances while visiting his parents in Arizona. “I’ve always been walking around dancing in public, so it never felt that crazy to me,” he said.

   He also realizes his public dancing goes against the usual traitlaced(刻板的) behaviors of doctors. “ The fact that it is for charity makes it hard to speak against it,” he said. I imagine some doctors could think it’s unsuitable for a doctor, but I’ve never met anyone strongly opposed(反对) to it. Overall the goal is to have an impat, and also show the value of individuality.”

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  My name is Jack I have been fighting with smoking for years.  I was about 22 when I started to smoke. I was at university and I was going out with somebody who was a very heavy smoker. It was because of final exams and a lot of pressure that I just tried it.

  I think I’ve tried to give up four times now. the first time I think I lasted about three months. But I was living in Russia at that time, and again ii fell into a very stressful situation and I think I just gave in very easily. The second time I just stopped with no help.

  So I’ve got to give up. It’s health worries and the fact that I just don’t feel as well on a day-day basis as I did when I wasn’t smoking. There is less energy. When I gave up , I could taste and smell so much more, and was just generally clearer in the head. And when you give up, you don’t have that constant anxiety of thinking, “When am I going to have my next cigarette?”

   Truthfully, I don’t think there is anything I like about smoking.

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Why did Jack have to give up smoking?

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