My boyfriend is 55 and has copd. He is having a hard time quiting smoking. What can he do to have some energy?

Copd. Stopping smoking will eventually help him. He should see his doctor about getting into the best health possible. Living a healthy life style is important. Your support is vital. There is no reason that making love should be withheld as this promotes well being.
Quit smoking! The best thing he can do is quit smoking! he will be so amazed at how well he will feel tobacco smoke free. Smoking is the #1 cause of preventable death in the us. And, with every puff, he is continuing to damage his lungs. Bottom line: he needs to quit and quit now. It is hard, no doubt, but it can be done.