Japan's National Police Agency reported Thursday that marijuana arrests were at an all-time high during the first six months of this year. Police said 1,446 were arrested for possessing, using or trafficking in marijuana, up 21.3% from a year earlier. Of those arrested for pot offenses, 63.2% were under the age of 30, suggesting that marijuana use is spreading among young people.

One hundred four people were arrested for marijuana cultivation, up 40.5% over the same period last year. Home cultivation of marijuana is assisted by the availability of seeds and grow supplies over the Internet and by consumers' fears of venturing into illicit drug markets.

The 40.5% increase in grow busts in the first half of this year comes after a 50% increase in grow busts during the first half of last year.

The record arrest figures come as Japan comes to grip with a growing marijuana culture. In the past couple of years, the country has seen repeated "scandals" around marijuana use, including the expulsion of three Russian wrestlers from sumo competition for smoking pot, the arrests of various celebrities, and a national freak-out over students at prestigious universities smoking pot.

The apparent increase in marijuana use in Japan comes despite mass media denunciations of it and despite harsh drug laws. Under the 1948 marijuana control law, any pot offense can earn a prison term of up to 10 years.