It is an excellent news that your husband was able to quit smoking. Wonderful things about body is it starts recovering itself from many harmful effects that were previously there but some damages which have already been made to the lung are irreparable. However over all health improves tremendously. You can simply consult a general physician and discuss if your husband feels any kind of health related issue or are there any cravings for smoking. A nor.al over all body check up will do. Simply get an xray chest, complete blood count, blood sugar,spirometry test for lung capasity , blood pressure. These tests are enough.