Comment by slibhb
For some people at that time, smoking was a non-trivial part of their identity. Or even a significant part of what it meant to be a proper Englishman (that and tea). Fisher strikes me as that sort, just look at pictures of him.
The (fairly obvious) lesson here is that people lose their objectivity when it comes to fighting over stuff that involves their identity.
My first thought was that obviously he was a smoker.
I loved cigarettes. I haven't smoked in almost 15 years and I might say I still love cigarettes. There really is no replacement for the feeling of being a smoker, waking up in the morning and drinking coffee with a cigarette as the sun comes up. That is a large part of what makes the addiction so bad.
I say this even with the benefit of knowing how horrible they are for health. It is why I quit eventually.
It is really hard to be objective about your partner when you are in love. A highly abusive partner at that.
I suspect the only thing stronger in humans than love is denial. The combination can be especially deluding.