Unit 3 A healthy life
“smoking in middle age is associated with memory deficit and decline in reasoning abilities，” concluded severine sabia and colleagues from the national institute of health and medical research in villejuif，france.compared to smokers，people who said they had quit cigarettes were more likely to adopt healthier behaviors，such as drinking less alcohol，being more physically active，and eating more fruit and vegetables，sabia reported in the journal archives of in ternal.the participants were aged 35 to 55 at the beginning of the study，which followed some subjects up to 17 years.the study also demonstrated how difficult it can be to conduct long－term research on smokers：more than twice as many smokers as non－smokers refu sed to take the memory test again or were not able to be re－tested，in some cases because they died in the interim.