he is in love with someone else and afraid to tell you. that realy happens when you love someone else, because your heart just isnt in it.

try something sexy

Smoking does reduce blood flow so it won’t be helping him but it’s probably not the main problem. I reccomend that you take the pressure off the situation by just playing with each other for a while and not have penetrative sex. Soon enough you might find he regains confidence in bed.

drink first it will relieve his stress that might work or just skip the foreplay next time if he can only stay hard for so long

Smoking can cause impotence in the long term but this is almost certainly stress. To get a stif**y you need to be able to relax which is why men get them in the morning, if you’re tense you won’t get one, or if you do then suddenly you think of something and whomp….. It gets worse when it happens once because as soon as you get into you thehn worry it’s going to happen… so it does. What to do. Have sex but not intercourse- touchy touchy – for at least a month don’t even think of it even if you both want to. Go back to teenage fumbling! If you are into or*l then that could work to show you are interested….. Then try more – you are an angel to be so concerned and appreciate that it could be what he’s going through. Take all the pressure off, keep loving him and it’ll come good.

My husband of 3 years in pretty much as your bf.
The thing is that he is not that stressed and he just refused to go to a doctor. I hope your bf will have more initiative and actually go see a doctor now.
If he continues like this, I wouldn’t suggest marrying him. It will ruin your life and your health.

They both could cause it…smoking restricts blood vessels, and stress is just….well, stress…don’t worry…he’ll come (no pun) around!!!