DH has always smoked. It’s annoying but it’s something I just accepted. He promised to stop when we had DC1 and didn’t, again I just accepted it and secretly seethed but never said much as it causes WW3 and he is extremely defensive about it.
Anyway we move house last year and finances are a lot tighter (not to the point we can’t live but less luxuries) We needed to move for various reasons and had to buy a complete wreck to be able to afford it.
He promises to cut down smoking as we need to tighten our belts and I also give up an expensive hobby in order to free up finances a bit so we didn’t feel the pinch of new house as much. I did notice him spending a fair bit of time outside but didn’t realise how much more as I’ve been working a lot of late nights etc to save for renovations.
In this time I also fall pregnant with DC2 which is probably impacting my anger as I’m hormonal as hell.
We have been trying to decide for months whether to spend money on a new roof and boiler, calculating costs and seeing where we can save some money to go towards it etc. Discussing things like fewer days out, less eating out etc. All perfectly reasonable things I am on board with and I thought we were working together to get things done.
Today I needed to check something on the bank account, admittedly I’m not normally one to check the accounts much as I am frugal and know what’s there but I did and can not believe how much he has spent on cigarettes. He is spending £16 every 2-3 days on average and almost £200 last month. He always told me it was something like £15/week which is annoying enough but it’s actually double this if not more. I’ve never noticed before as we have two accounts and he usually pays for cigarettes from account 1 which I never check but he has had to use account 2 this month due to an unexpected bill wiping out his usual pot.
I confronted him and he has gone ballistic saying I am financially controlling and that he earns the lions share so can spend what he wants. He has also said we can afford it so what’s the problem and as I’ve never noticed it before surely it can’t be an issue as if it was effecting us it would have flagged up.
He has also said he would never stop or cut down and would rather not have a new boiler and smoke instead and that I’m not to speak about it again. He also said he would rather not eat all month than give up smoking 
We then argued and he has left to stay with his mum for a bit as he can’t be controlled in this way any more.
I don’t know if I’m being utterly unreasonable to be furious about this. I’ve given up my hobby, cut back my cloth wherever I can to help get the house into a more livable standard and also have done less with the children and all the time he is puffing away on £15 worth of cigarettes every 2 days 
I wouldn’t mind so much if we were rich but we absolutely are not. It’s not even the money as such it’s more the fact he’s happy to spend so much on himself when myself and the children are cutting back and he clearly isn’t!!
Am I just being a hormonal arsehole here or am I justified in being seething about a man smoking who I knew smoked when I met him?!
I’ve grown up in the past 10 years, had kids, sacrificed a lot and yet he seems to get to just say live with it because I won’t change and there’s nothing I can say about it is there?!