Your husband is having symptoms of weakness and feeling more hungry which could be early signs of diabetes mellitus.
Given that he is also overweight and a smoker, I would suggest that he gets screened for hypertension and diabetes. He needs to initiate smoking cessation as well and if he is feeling sleepy during the day it may be caused by obstructive sleep apnea. Diagnosis with sleep study.
Would you like to video or text chat with me?