English is my mother tongue and we often follow the British pronunciations.
However, something caught my attention recently. In my Oxford dictionary, I noticed that so many words that begin with 'wh' have a leading 'h' as part of the phonetics. Here are some of them:
what
when
wheeze
wheel
wheat
whatever
whip
and the list goes on...
I have heard many US accents but never encountered this. Perhaps I never noticed it.
Thus my question: Do Americans really use these words with a leading h or at least are they supposed to?
Thanks!
EDIT: I am not using the net as my source here. It's a printed book. So for those who are unsure, here it is:

BTW, the exact title of the dictionary is:
Oxford WordPower
English-Arabic dictionary
ISBN: 0-19-431485-5
NEWEST EDIT: Please do not consider this a duplicate of Hwat, hwere, and hwy?
That discusses the origins of words and various 'accents'. Yes, the examples are related, but my question is different and simple. I'm more keen on knowing if Americans (today) use the leading h pronunciation (at large)?
Ever since I started my study of languages (my mother tongue included), I've tried to stick to a standard pronunciation from the dictionary. Thus in a way I look at the dictionary's pronunciation as the right way to pronounce words, regardless of what people really do. So now after seeing the leading h pronunciation related to Americans, I'm curious to know if they really do so.
And after the kind of responses and links I've seen on this subject today, I don't even think that an average non-academic American really knows this exists. Perhaps I'm wrong.