I don't go out of my way to buy organic, but I do attempt to avoid pure crap like Twinkies. Its hard to avoid chemicals and preservatives, so I guess every little bit helps, and when I have the chance to select something locally raised or attempts to call itself organic, I'll probably select it. But everything you touch, no matter how innocent it appears, is just loaded with chemicals. So theres no avoiding them unless you have a total change of your habits entirely.
I'm sitting here, and theres a bowl of Keebler "sociables" crackers I had with cheese earlier. I know if I look, theres probably some weirdo shit in it, like "malodexterin", and the wheat is probably factory farmed with all sorts of enhancement fertilizers in it. Every single day, its in everything. So, you're fucked. A few eggs and celery ain't gonna help. But I do it anyway, in an attempt to balance it out, minimize it, whatever.