Grandparent Visitation and Drug Use

Don't drink. Don't smoke cigarettes. Don't even socialize much. I do have an addiction to marijuana that I am getting help for. My daughter(20yrs) and I(40yrs) do not get along. Ever since she turned 13yrs she has become more defiant and mouthy. I developed a chronic illness when I was 24yrs. My daughter was four. To young to have to go through this(me too). I was a good mother and did everything for her. Even kept her out of Juvi(a few times). She skipped school, didn't come home for days, promiscuis, had people in the house who stole from me. And I don't mean a couple dollars. She drinks ALOT and she isn't 21 yet. My daughter has smoked weed herself. Bought weed for her friends and dated people who sold drugs. Her second babys' father has been to jail(don't know how many times). He dates other girls and she knows it. How can she deny me visitation to see my granddaughter because I smoke alittle weed(but promised to not smoke around the child) when she did/does these things and puts up with that kind of treatment. They are homeless with the baby's father staying with them at an old friends house. There were times when I was easily irritated and took it out on her. I have apologized a million times for my behavior. My daughter doesn't want a relationship with me so she says I can't see my granddaughter. I'm always praying to quit and I did for 2 1/2 yrs. I'm trying to quit again. Even thinking about hypnotism. I want(need) to see my grandchild but don't know how to get visitation while I struggle with this. (You have no idea what I deal with and have been through with my illness). Is there any way to get to see my granddaughter while I continue to get help with my addiction through therapy? My granddaughter and I are best friends.