Tommy Corbyn, 26, was seen smoking the roll-up with a friend outside a cafe in Notting Hill, according to
People caught smoking cannabis can be issued an on-the-spot fine of £90.
A friend of Mr Corbyn’s told the newspaper the substance he was smoking is legal in the UK and will be sold in his new ‘National Hemp Service’ shop.
The 26-year-old has launched two companies – the National Hemp Service and The Hemp Cafe – to cash in on the craze for cannabis-related paraphernalia.
Tommy Corbyn, 26, pictured with his girlfriend Chloe Kerslake-Smith, 25, has been pictured smoking a suspicious substance outside a London cafe
The 26-year-old is pictured with his father, Labour leader Jeremy Corbyn
He and his girlfriend Chloe Kerslake-Smith, 25, are due to open up the businesses in north London this year.
Miss Kerslake-Smith previously told the Daily Mail: ‘We’re renovating the premises and hope to open in the near future. The National Hemp Service is like an alternative National Health Service.
‘We’ll be selling a variety of hemp-derived products. Everything will have undergone lab tests to ensure it meets the UK market standards for their cannabinoid profiles and potency.’
There is no evidence that the roll-up cigarette Mr Corbyn Jr was seen smoking contained cannabis.
Her boyfriend’s Labour leader father has advocated decriminalising the Class B drug.
He has said arresting people for having small amounts of cannabis is ‘not a particularly good idea’.
Corbyn Jr has launched two companies – the National Hemp Service and The Hemp Cafe – to cash in on the craze for cannabis-related paraphernalia. A Facebook preview of the National Hemp Service is pictured
Jeremy Corbyn’s sons Seb, Benjamin and Tommy are pictured applauding his speech at teh Labour Party Conference in Liverpool in September last year