Good capture of the smoke. Nice, clear image with good contrast. The bottom right corner is distracting; it looks like you either rotated the image and didn't crop, or caught a sliver of a wall.
I quit smoking over 9 years ago so my first reaction is always 'yuk' when I see someone smoking. The large area behind the subject without any detail is somewhat disconcerting at first, and I find myself wondering if you did that on purpose, although it would appear not. On the other had, more detail would only distract from the main idea, so I think it actually works better this way. Brighter highlights - perhaps in the flowers - would help balance it overall.
Man, talk about happenstance. You clicked the shutter at just the right time. I think I'd like pure BW with some tonal adjustments but the composition and "catch the moment" is spot on.