Just some minor issue.

Hello everyone, im 26m, t1 for 16years, mdi. Maybe it should've been posted to some another sub but i hope you will help. First of all i know that i am incredibly stupid to do such things especially with t1, but now i am Worried as hell, summary about my health issue: for last 8-9 years i was smoking weed on a daily basis like waken'bake also had experience with other drugs and alcohol even earlier, but it was moderated also i was young and had more health "reserve" also i at least tried to keep my diabetes under control (i wasn't doing my best plus teenage feel of fatalism when u have some, not serious but at that age i thought that it would end my normal life plus all horror stories by endocrinologists, condition, i was stupid enough to not understand that if i made a little bit more effort to try to stay healthy there would be no problems at all but as i said i was stupid), for last 5-6 years almost only weed and i was feeling decent, dieting, no major complaints, physical activities, everything was under control, even my biochemical tests were good, for my life style especially, but at one moment about year and a half ago, i realized that its time to quit this bad habit, funny that it was a big mistake, after some time i felt urgent need to replace it with something, and one led to another, i started using coke and sometimes alcohol, also at some point i started to smoke again, for the first time it was fun and games but then life began "falling apart" at some point i felt like my kidneys hurt so i quit coke and weed, but i started to smoke cigs and moderatly drink alcohol,must say that before all of this i hadn't that much free time because i studied but after graduation i had a job with a lot of free time, then it became worse, at some point i felt like "f it i do what i want and dont care about anything" then started to drink "not moderatly" no proper dieting at all, also some other drugs were involved during this period, 15-20mmol was normal level of glucose to me, social and job problems came in, so not to prolong more this text, at this point i feel very stupid for this behavior, i feel like my health have been undermined by myself and my stupid decisions, especially i felt it after kidneys hurted a bit again, i want to change everything and wonder if at least some damage that i made for this year and a half is reversible with proper dieting and glucose level control, i already started trying to "normalize" it, quit everything but cigs but currently trying to, from this point no alcohol at all as well, or i must expect kidney and liver failure and feet amputation for those decisions i made, sorry for mistakes, english is not my native and for a long post with self analysis and soul searching but i feel devastated, maybe somebody had experience like this and overcame troubles and can advice something. Thank you for your time.