The following article was posted recently on the U.K forum site. It content is pertinent to wooden bodied bench planes. Of particular interest was the 3rd reason given for choking;

Third; yet another cause of choking planes may be the fact that the shaving taken is too wide. This means the plane iron is not ground correctly. The plane iron should never cut at its edges, but should be curved as in fig. 5. If the iron is straight across (as it may be when new) grind it, so that it is curved.