What do you do when you crave salty crunchy food?

I am a junk food addict. I need to lose 40 pounds for my health, self esteem, and sanity. I have tried repeatedly to eat Paleo, and each time I am thwarted by the need for salty crunchy food. Nuts, celery, apples, carrots and other crunchy whole foods don't take care of the craving. I firmly believe Paleo is the healthiest way to eat, and my body responds really well to it. I've lost as much as 8 pounds in a week when I have stuck to it, but then I have a craving, eat my face off and BAM! All the weight is back.

Any other reformed salty junk food addicts out there with advice?

EDIT: Thank you all so much for the advice. Kale chips, pork rinds, homemade almond crackers, here I come!