Unemployed boyfriend keeps vowing to quit smoking weed... but doesn't?

My bf of over a year and half is unemployed currently and has been smoking weed during our entire relationship. I don't have a problem with weed unless it creates a problem for me. Before he lost his job, his smoking wasn't a problem for me. Now it is. He spends his days smoking and "chilling" instead of applying for jobs and even if he got one, he wouldn't pass the drug test. I've been patient and silent about this issue, and multiple times he's vowed "today is my last day smoking. it's time to really focus on finding a job" and then he doesn't do it. When he says that I say " I'll believe it when I see it" and he says stuff like "well now you're seeing it babe!" but then two days later he goes and buys more weed. I'm sick of it! What can I do here? I'm sick of paying for everything! I'm sick of being the only one pulling my weight in this relationship. I'm sick of him making promises (without any provocation) and then breaking them!
Do I just have to dump him? Help?
Unemployed boyfriend keeps vowing to quit smoking weed... but doesn't?
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