Never really wanted a tattoo, myself, for pretty much the same reason I never really have ever wanted to get drunk -- I don't want to inflict the resulting pain on myself (tattoos involve needles, getting drunk involves hangovers). I've never really felt the desire to smoke, either, since I know what it does to one's lungs. I guess I never understood why anyone would want to do those things and possibly mess up their bodies, though I certainly don't pass judgement on those who have done those things in the past. They just were never for me.
"Oir is leatsa an rioghachd, agus an cumhachd, agus a gloir, gu siorraidh, Amen." ("For Thine is the kingdom, and the power, and the glory, forever, Amen" -- Scots Gaelic)