If I woulda known that smoking's just a hoax
I coulda refused them, I'd never even be coaxed
I shoulda listened to what my elders had to say
And then I woulda been a lot happier today
If it woulda been explained clearly to me
So very, very clearly so that I could plainly see
That smoking is a mug's game, it really, really is
I coulda avoided it and not enslaved myself to it
(Sydney, Australia - 2003)
Alessandra Liverani
http://www.poemhunter.com/poem/coulda-woulda-shoulda/