I myself had problems with abusing drugs and heavy drinking back in the day. I'm still a functional alcoholic but no more drugs. I'm DONE with drugs. Part of me had to let go of my worries and concerns in life and let go of my emotions and care for the world. Once you understand and accept the cruel joke called life and inevitable death you care less and it makes using less gratifying. One big reason people use is because they care too much, not the opposite ironically.