Rock candy pear water rock candy pear water's efficacy is sweet, sour and non-toxic, and it has many effects on organs and lungs. People who eat more pears are far less likely to catch a cold than those who don't eat or eat less pears. Therefore, some scientists and doctors call pears all-round healthy fruits or general practitioners. Now the air pollution is serious. Eating more pears can improve the respiratory system and lung function. rock candy pear water protects the lungs from dust and smoke in the air.