He will never change. This is how it is forever.
If he had an equivalent drink habit - pissed daily for half the time and then hungover and moody for the other half of the day - would you tolerate that?
I doubt it - this is the same.
You need to decide if this is the best childhood you can give your daughter.
You can give her a better life than this - one where she has a Mum not pre-occupied, anxious, distressed 24/7 with walking on egg shells around the moody stoner - rather a Mum who is happy joyful and engaged with her DD.
What does this teach your DD about how to conduct a relationship - that she should hang around on her partners coat tails waiting and hoping for the crumbs of their attention - that she deserves and should accept the bad moods? Do you aspire to this for your DD? Because this is her blueprint and is all she knows so this is what her future relationships will be like.
If you choose to change nothing - all you can expect is more of the same.
And of course you deserve so much more that this - I am only focussing on your DD because you can choose to endure/accept bad behaviour with low standards and boundaries - she cannot.
You also need to take responsibility for enabling your OH. You finically support the family he only works full time but has an expensive daily habit. You keep a roof over his head, keep him fed and watered, tolerate and tip toe around his bad moods, are grateful for his moments of calm/crumbs. All of your actions enable him to continue to be an addict / have a destructive habit.
Keep investigating - hope these links help.
www.talktofrank.com
www.marijuana-anonymous.co.uk