The government has been criticised for failing to consult properly on its decision to criminalise a widely-used drug.
The home affairs select committee – a group of MPs who monitor the activities of the home office – said the decision to ban khat "has not been taken on the basis of evidence or consultation" and called for the proposal to be reconsidered.
All drugs bans must be approved by parliament. However, in 2010 the coalition government passed legislation that enables the home secretary to authorise a temporary twelve month ban while they consider whether substances need to be taken off the shelves for ever.
This is an attempt to crack on so-called 'legal highs' - drugs that have little in common apart from the fact they have yet to be banned.
Deaths from legal highs continue to rise and were blamed for 52 deaths in 2012, up from 29 in 2011.