One real danger for them is that string they put on balloons and gifts. One will try to swallow that stuff until he is foaming at the mouth - The Maine Coon - the ditz of the family
That and rubber bands. Our steroid size cat ate one once. Thankfully it passed at least most of the way thru. We had to pull it out, I couldn't stop laughing as it stretched and finally snapped. It could have caused him some serious problems though, so now all rubberband are stored in a drawer he can't open.
My cat eats grass and licks everything. from carpet to shoes to computer monitors.. i have a strange cat.
The cat we had prior to steroid kitty loved to stick his entire head in my shoes when I took them off.