Do you dry the leaves first of just wait until they fall in the Autumn, I suppose this is the be time of year for gathering up those apple leaves.
Have you tried other fruits too?
How about pear, plum, cherry or peach tree leaves are they good too?
Are you sure it isn't the just the weed that gives you a high? Do the apple leaves give a buzz on their own?
I've tried both mint and sage herbal cigarettes before, I dried the the leaves on kithcen roll in the microwave and rolled some finely chopped leaves up with a big leaf. Both of the aforementioned leaves tasted alright but didn't give me much of a buzz, I think I prefered the mint, I didn't mix it with weed because I'm not that keen on the stuff.
I've heard that dried bananna skins are supposed to give you a buzz but I haven't tried them, have you?