The potential Prime Minister wants to examine if such measures unfairly target low-income earners.

Boris Johnson to review 'sin taxes' if he becomes prime minister

The four companies hoped to overturn a High Court judgement which upheld the government's decision to force them to use plain packaging.

Tobacco giants lose appeal over plain packaging

Australia's High Court has upheld strict anti-tobacco marketing laws. Cigarettes will soon be sold in green packets with graphic warnings.