Hash oil
The new rules apply to England, Wales and Scotland.
These changes come about following a long battle by campaigners.
It is estimated that over a million people in the UK rely on medical marijuana for pain relief.
'It is in no way a first step to the legalisation of cannabis for recreational use.'
'A momentous occasion for us.'
The former Tory leader said the war on drugs has been 'irreversibly lost'.