The South Korean Embassy in Canada tweeted Thursday to warn its nationals currently studying or visiting Canada that if they are caught smoking marijuana on Canadian soil, they can still be held criminally liable under South Korean law.

Recently, Canada became the second nation in the world to legalize the recreational use of marijuana, following Uruguay Uruguay. South Korean criminal law jurisdiction over its own citizens extends beyond its own national borders. As a result, South Korean citizens caught engaged in activities deemed illegal within South Korea can still be prosecuted as soon as said national returns to Korea.

The embassy’s announcement stirred up a chain of protest on social media.