Oh, yeah. I do the crunchy foods myself. I don't know where the line is between an unhealthy habit and an eating disorder, although there are a lot of places to get help for either. I'm "just" in the unhealthy habit category, but I found a few tricks that work for me.
First, I make a point of asking myself if I'm really hungry before grabbing something outside of a mealtime. [Please don't ask if I'm always 100% honest with myself!] I also then ask why this particular food? Some people just need to raise their blood sugar, some are looking for tryptophan-containing foods to increase their serotonin levels, some like the chemicals in chocolate. So, my question to myself is really, am I using this food as a drug? Some times that will stop me. And then I'll ask myself, why not try doing something else for 20 minutes and see if I still want this? Sometimes I get busy enough I don't come back to it or the need is gone.
I do know that I have a much harder time stopping the chow session once it's started, but that it's important not to just give up if it has. Sometimes I'll say I'll finish the bowl or box or bag or what have you and then stop (a physical limit is a good thing) but it doesn't always work.
If you're unhappy about this habit, you might talk to your doctor about it but you want to be clear that you're not looking for a diet plan but a "how do I control myself" plan. Yeah, s/he'll probably refer you to someone else, but you do want to be healthy and happy. I sympathize with you; I really do. I've finally managed to make all of my tricks work well enough that I am now happy with how I look (well, pretty much anyway) but other family members have found no benefit with them at all. Good luck to you and don't beat yourself up and feel that you're doomed to have this habit forever. Much love...