人对环境中有害因素的易感性是有差异的。对这种差异的遗传学基础的研究已有一些报导。例如,遗传性α_1-抗胰旦白酶的缺乏是易患肺部疾病的主要因素。调查表明,α_1-胰旦白酶缺乏的工人,在接触镉或谷物粉尘后,肺部疾患的发病率高。 There are differences in the susceptibility of people to environmental harmful factors. There are some reports on the genetic basis of this difference. For example, the lack of hereditary α 1-antitrypsin is a major predisposition to lung disease. Surveys show that workers with alpha 1-trypsin deficiency have a high incidence of lung disease after exposure to cadmium or cereal dust.