Canadian Prime Minister Justin Trudeau on Thursday introduced a measure that would legalize recreational marijuana throughout Canada, The New York Times reported.

The legislation, which is expected to pass Parliament, would make Canada the second country in the world to fully legalize recreational marijuana use, following Uruguay.

If passed, the measure would take effect in the summer of 2018.

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In introducing the legislation, Trudeau fulfilled a high-profile campaign pledge to push for full legalization of the drug. In the U.S., eight states and Washington, D.C., allow forms of recreational marijuana use, but it remains federally prohibited.

The Canadian proposal, however, comes with a fair number of challenges. For example, the government will have to develop a way to test potentially impaired drivers for intoxication by marijuana. 

Each Canadian province will be allowed to decide age minimums for possession and where pot can be bought and sold.