How about carrots? They are very crunchy and you have to work your jaws hard, which is good for anyone with an oral fixation.
I admit to having an oral fixation.
But I never smoked.
Because it smelled bad and gave me a terrible allergy attack. Also I am a singer, and smoking kills off your breath support. I worked too hard to get those high notes to lose them.
I stick with food and the occasional bitten pencil and chewed up straws.
And now, I try to tell all the smokers I know and care about to please think about quitting. Last month, I lost two people that I cared about to stage four lung cancer that had spread before they were diagnosed.
It is very heartbreaking to lose people in such a way.
Please don't smoke.