Yet another fireworks

Yeah, I know I am a week late, but I was so dissappointed and upset with my fireworks photos, that I needed to cool down before looking at them again. Actually, this seems like the only one worth showing. Shot with wide-angle, ISO 800, 1 sec exposure and … backpack used as tripod. I took the tripod with me, all right, just the proper attachement was still at home :(. I tried exposures from 2.5 sec down, and 1 sec was definately the best. But still, the picture is not as clear as I would like- and there was so much smoke around the fireworks on other photos. Cheap material? Too strong of the wind? High presssure?