Fran, how old is your H? Has he had any tests for heart disease? The article cited below says that ED in a smoker can be a sign of heart disease. (My bf started having problems with ED when he was in his 40's. At 54 he had quad bypass surgery.)

You said: I have also noticed that the E can fade pretty easily and he needs more direct stimulation (such as oral). I have been taking this personally somewhat

Do NOT take it personally. Don't. But do suggest he have a complete physical especially including a cardiovascular checkup.

The news is not good:
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QUOTE:

What are the physical causes of impotence (erectile dysfunction)?

Smoking. A recent study at the New England Research Institute in Watertown, Massachusetts, found that impotence was equally common among smokers and non-smokers in general. However, among men with certain health problems, those who smoked were much more likely to have potency problems. For example, 56 percent of smokers with heart disease were completely impotent compared with only [ONLY??!! \:o ] 21 percent of non-smokers with the disease.

Alcoholism. Excessive alcohol consumption disrupts hormone levels and can lead to nerve damage. This type of impotence may be reversible or permanent depending on the severity of the nerve damage. Some clinical studies suggest about 25 percent of all alcoholics become impotent--even after they stop drinking.

Article is here