The EC horror comic book covers were so very gruesome that I was never tempted to look inside them.
Unfortunately, EC's funny animal lines (my main interest) stopped during 1947 and 1948, just before I started buying comic books at the newsstands, so I never got a chance to see them there. In addition, they never came to the used comic shelves in bookstores and newsstands and charity thrift shops in Winnipeg and Chicagoland, while I was looking, and my older cousins never had one. So, I never got to see one during my youth. I assume that they weren't sold at all in Midwestern and Western Canada, and weren't very popular in Midwestern USA (which may be why they only existed anywhere, from 1946-1948 (with most lines ending in 1947, and why they changed from "Educational Comics" to "Entertaining Comics").