For South Koreans in Canada, the police in their home country have no problem harshing their mellow.

Canada became the second country in the world to legalise recreational marijuana last week, but for South Koreans hoping to try the drug, their hopes have just gone up in smoke. Police in South Korea have repeatedly told their citizens not to partake in this newfound freedom, with the latest warning coming this week.

"Weed smokers will be punished according to the Korean law, even if they did so in countries where smoking marijuana is legal. There won't be an exception," said Yoon Se-jin, head of the narcotics crime investigation division at Gyeonggi Nambu provincial police agency, according to the Korea Times.

South Korean law is based on the concept that laws made in Seoul still apply to citizens anywhere in the world, and violations, even while abroad, can technically lead to punishment when they return home. Those who smoke weed could face up to five years in prison.