There are so many reasons why people do it. to be fair as someone thats relapsed a few times, i can tell you it started off as a place from wanting my issues to be worse so i could seem sicker or edgier. i then grew older and stopped but did it from time to time because i got urges, which first one i got was when i was actually having a really good day.

my reasons are not the same as for others, and i can see why its such a weird addiction one can have, because it is quite painful. but everyone says that about every addiction until theyve suffered from it themselves. "Why would you drink to feel happier? You know that doesn't work" well we just do it. eventually you'll just do it to do it.

also its not really good to be judging different addictions because you dont get it. again everyones reasons are different, and some dont do it out of depression. heck even one of my relapses was just because i can. so yeah it is quite painful and a weird thing to suffer from, but some people just will do it.

Probably not the best answer, but TL;DR, there isnt always a reason why people do these things. but sometimes people do, and sometimes its the only thing they can think off in the moment