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Marijuana cultivation and possession in Thailand has been decriminalised, a dream come true for an ageing generation of pot smokers who recall the kick the legendary Thai Stick variety delivered.

The stated intention of the country's public health minister to distribute one million marijuana seedlings for cultivation has added to the impression Thailand is turning into a weed wonderland.

But for the time being, would-be marijuana tourists will be disappointed.

Thailand has become the first nation in Asia to decriminalise marijuana - also known as cannabis, or ganja in the local lingo - but it is not following the examples of Uruguay and Canada, the only two countries so far that have legalised recreational use on a national basis.

The government has said it is promoting cannabis for medical use only, warning those eager to light up for fun that smoking in public could still be considered a nuisance subject to a potential three-month sentence and 25,000 Thai baht ($A1085) fine.

Extracted content remains illegal if it contains more than 0.2 per cent of tetrahydrocannabinol, or THC, the chemical that makes people high.

Thailand is seeking to make a splash in the market for medical marijuana, the benefits of which are generally derived from other cannabinol chemicals the plant contains.

Thailand already has a well-developed medical tourism industry, and its climate is ideal for growing cannabis.

"We should know how to use cannabis," Public Health Minister Anutin Charnvirakul, the country's biggest marijuana booster, said recently.

"If we have the right awareness, cannabis is like gold. Something valuable and (it) should be promoted."

He said the government prefers to "build an awareness" that would be better than patrolling to check on people and using the law to punish them.

"Everything should be on the middle path," Anutin said during a news conference ahead of Thursday's decriminalisation.

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