An impatient customer waiting to buy cannabis plants fought with staff after they told him the product was out of stock.

The buyer, 50, had driven for more than two hours to reach the Maejo University in Chiang Mai province, Thailand on June 15.

However, he was furious to find that the daily limit for sales had already been reached.

Workers and fellow customers tried to appease him, but his temper only flared, and he threw punches at staff carrying marijuana saplings from a truck.

A man who intervened between the two was injured in the scuffle. An emergency team arrived to tend to his wounds while the angry customer was taken to a separate area to calm down.

Cannabis was decriminalised in Thailand on June 9, and Maejo University started selling the plant a day after. The marijuana named Maejo 03 is sold at 30 THB (0.69 GBP) per tree, but sales are limited due to high demand.

An online reservation system has helped facilitate the process, with each buyer is only allowed to purchase five trees per day.

Doctor Sudked Sakunthong from Maejo University said: ‘We've sold about 50,000 trees so far and the purpose of this is to make cannabis more accessible for health reasons.

‘Currently, it's not cannabis season, so we have to use technology to assist its growth, which takes about 18-20 days.'

Although recreational use of cannabis or hemp is no longer illegal in Thailand, users can be fined up to 25,000 THB (576.82 GBP) or jailed for up to three months for public nuisance offences connected to using it.

Under the change in legislature, which came into effect last week, anyone can buy marijuana products and take them home to smoke. It has led to hundreds of stalls and shops springing up around the country openly selling the drug.

Ministers hope the move will boost the country's economy through marijuana's links to agriculture, medicine and tourism. They have even encouraged residents to grow cannabis at home and sell it.

However, since marijuana's decriminalisation, several people have been admitted to the hospital after using the drug. A fifty-one-year-old man later died of heart failure as he suffered chest pain after consumption.

Opponents to the move claim it could cause long-term metal health problems among people who use it regularly, such as cannabis-induced psychosis.