First time I ever smoked it, maybe 20. But just in a blunt, like $30 worth of crack. Got a little buzzed. First time I smoked it in a proper pipe, I was maybe 23 and was in Guatemala, went out alone in the middle of thenight, down some dark ally way, met a homeless crack addict. We went in an abandoned building together, and though I barely spoke any Spanish, and him not a word of English, we hung out for like 6 hours. He showed me how to do it just by muttering "mmhm". Also smoked crack next to a beautiful river in the jungle. I remember thinking "wtf am I doing". The interesting thing was, I was hiding this from my gf at the time, and she somehow found me in the middle of this ally, 15 minute walk from our place, in the middle of the night (holding a crack pipe, just having excited a shack with some old guy).
That crack was extremely cheap, $1 for a $20 rock.
Hope to never smoke crack again. Never became a problem for a few years after I tried it, haven't done it in half a year at least and no plans to, with plans to actively resist ever doing ti.