Boyfriend told me to abort her!

Hi, I'm 15 weeks and 4 days pregnant and before I was pregnant I was a daily weed smoker. I quit as soon as I got a positive pregnancy test. My husband is the only support I have and he won't quit smoking and I have to pay for it. Me being young, I am 18, I do not have a job except to babysit my two nieces and I get $20 every day of babysitting. Well guess where that goes? He promises everyday that he will quit and every day he breaks it. So I told him I was leaving and he told me to abort the baby since I'm being a bad mother by kicking the father figure out. But am I wrong ? I want to leave... I would be so much better off.. but I have no where to go and it sucks. What should I do?