From my perspective and my best rationalisation of it, when I'm bored or stressed I reach for a dopamine hit and weed is a great source of one. The next day I'll have a low and there's a 'battle' between the rational and want. The rational side almost never wins and I'll be in a daily usage cycle for months.
That being said I think it's an easier drug to break the cycle of with planning, since it only takes a few days of no use to dramatically improve my chances of resisting and honestly, if I didn't suffer from poor memory performance, I'd be okay as a daily smoker. But working is next to impossible at the level needed as a SDE.