I have been smoking pot leaves for over 40 years and i have never got a headache from smoking leaves.It is one way i can judge if the plant will be any good.I agree that they are not the best tasting,some are better than others,but it is better than going without.
Put them in the oven at 250 till dry,then smoke up.I would not smoke them in a bong,unless you want to cough up a lung.OPH