I picked it up when I had just started college because I saw how fun it looked and I asked a couple friends if I could try doing it for a song or two. I've been doing it since then. I have friends who record their own songs for their own demos, mixtapes or they do it just for fun, and they go to me if they want me to record the chorus, hook or adlibs. Sometimes it's me doing the chorus, but sometimes I just record what I think sounds good, then send it off to someone else for them to do the final recording.
I also help them edit songs and place an a cappella over the instrumental which is a big pain the behind sometimes.
I got a cool audio editing and recording program for my birthday yesterday from my best friend. He uses it a lot too.