Should I let him come home?

My husband has a narcotic addiction. I asked him to leave when I overheard a doctor tell him he tested positive for cocaine.I really love him and want my marriage to work but my 17 yo daughter said she would leave if I let him come back. I work nights so she has to be here with him alone when he's high. He also embares her when her friends are here. My daughter is pregnant (2 months), (she also had a miscarriage in aug). He says that he has it under control. I asked him to either go to rehab or marriage counseling. He said he could do it on his own. He says he hasn't abused them since he's been gone.He left in Oct. He's lied to me before. He has heart and back problems and goes all over the place to different hospitals saying he has pain. I don't know if he's telling the truth or not. I miss him. I'm lonely and feel scared with all the pressures I have with work and my daughter. I love my daughter with all my heart. Her daddy died of cancer when she was 5. What should I do?