Is it bad to eat cedar wood?

my friend is always chewing on wood, not chemically treated or anything just wood. she doesn't consume the wood, she just chews on it then spits it out? she claims she's addicted to the taste? ever since she got a cedar wood sauna shes always LOVED the smell of the warm wood. but now she's chewing on it? what's going to happen to her health wise? like her teeth, stomach, colon, mouth, tongue and what not?