Everyone is positive that you'd get nothing, but nobody seems to have tried.
If you want to try (why not, what's there to loose?), try butter instead of smoking it.
To smoke it, you have to dry it first, which takes time, and like others said, smoking non-bud will usually give you a headache before anything else - but you can get high from leaves and stuff, maybe not from baby plants though.
So I think you should rather make canna-butter out of it.
But maybe your best choice is to plant it somewhere "guerilla" and you'd have done something good.
It's an old thread - please let us know what you did in the end.
But my opinion remains valid.