Hi Marle,
I might have grown up sooner if my mom and dad had either imposed rules or kicked me out when I was clean and in my 20's. They were both so thrilled I wasn't using anymore that they let me get away with whatever. I came and went as I pleased, worked but kept all the money for myself, never even washed a dish in their home but I felt totally entitled to live their and eat their food. After my dad died I lived in the house when my mother moved out! She still payed the mortgage/taxes, and bills while I lived there rent free. Even typing this now, I can scarcely believe what I got away with. And to top it off, I had an attitude most of the time and demanded stuff from her. Did I stay clean? Yes, for 10 years more. But I didn't learn how to be a grown up or how to respect others for a much much longer time. So do what you feel is best - it probably is.