Neurologist seeing increasing number of side effects from

An Auckland Neurologist says he is seeing increasing numbers of people suffering side effects from huffing nitrous oxide, with some users ingesting enormous quantities on a daily basis. Community leaders say there needs to be tighter regulation around who is able to buy and trade the product that can easily be bought in large thermos sized cannisters with the equivilent of hundreds of hits. Professor of clinical neurology at Auckland University, Dr Alan Barber spoke to Lisa Owen.