[填空题]Although nicotine is probably the well-known chemical in cigarettes, it is not necessarily the one that changes the psyche of the smoker when cigarettes are smoked.

Although you’ll probably live longer than you imagine, don’t count on being healthier. The need for and the cost of health care typically increase dramatically as you age. On average, for example, a 40-year-old man consumes about $2,000 a year in health care services, whereas a typical 75-year-old consumes five times that much. That’s why, as the population ages, huge inflationary pressures are put on the health care system. How big will those pressures be in the next century Over the past 40 years, health care costs have risen an average of 70 percent faster than the general rise in prices—and that was before the boomers (新定居的人) started to gray. The federal government predicts that by 2030, as boomers enter their 70s and 80s, health care spending will top $16 trillion, representing nearly 1 out of every 3 dollars in the economy. Who will pay the bill No one knows for sure, but it’s a good guess that the next century’s elderly will become res