Last week police in the south-eastern town of Porvoo entered an apartment in the town centre to confiscate some 250 cannabis plants. Police say the find is part of a growing trend towards domestic, rather than imported, cannabis consumption.
"I don’t have precise figures to hand but the practical experience is that cultivation has increased substantially," said Janne Levälampi of Porvoo police.
Indoor cannabis growing is popular in the winter months, according to police, who say detailed instructions are available online. Other drugs tend to be imported from neighbouring countries, but cannabis available in Finland is mostly local produce.
"They could even put the 'swan sign' on it," said Levälampi, citing a popular Finnish label marking a product as domestically-produced.
Modern strains of cannabis are much stronger than before, and are associated with psychiatric problems, according to Marianne Korpi, a Porvoo nurse specialised in dealing with the effects of intoxicants.
She says there is wide variation in the effects on individuals, but the consequences can be severe.
"In the beginning things can be fun but in some cases it can lead to isolation, withdrawal and even psychosis," said Korpi, who says she fears increased use of cannabis thanks to more positive attitudes towards the drug.