A cage made of cedar is perfectly safe, and there is absolutely no reason to avoid it.
The issue with cedar shavings is primarily related to the dust; the dust particles are also potentially hazardous to human health. Another issue is the high levels phenols - why pine and cedar smell so intense. This is irritating to your animals respiratory system, and is known to cause issues, i.e; upper respiratory infections.
Houses (and enclosures) made from cedar are safe. Reason being; the surface area is smaller (as it is solid), and the issue of dust particles is removed. So, the cage is safe - but shavings are not.
I’ve kept hamsters over a decade, and am all too familiar with the world of safe and unsafe building supplies haha.
Last edited by Emc; 04-26-2019 at 11:35 PM.