Trying to quit hhc

hi guys i am an 18 year old from ireland trying to quit hhc. at the start it had become just a one off kind of thing with my friends and than i didnt use for a long time and than about a year ago i bought a 1ml blue onlygram in a vape shop and than i bought another and another and before i knew it i was buying them 3 times per week and it had become alot more than what it should have all day al i would think about was gettin high and it ruined my work quality and friendships iv come to reddit because i didnt know where else to get advice as no body in my family knows about this what is the best way to really get clean i stopped for 3 days about 3 weeks ago and since i relapsed its so fuckin hard not to keep getting can somebody give me some tips please.