You might want to research this to see if you can use your own shavings. Some people do use some cedar without a problem, depending how odorous it is and how well ventilated the area is. Pine also gives off some fumes which aren't good, as do some other woods.
In terms of ventilation, I essentially have a 3 sided coop; very breezy. My chickens are LF and full size; no chicks at present. I happened to acquire a few bags of someone's unused cedar shavings, and am using them in small quantities, mixed in with pine and some hay. They have almost no cedar odor. I do know there are different types of cedar, and that's really all I know about the subject.
I would not use cedar in an indoor brooder, though.