In January and May 2004, changes were made to Canada's electoral laws which significantly reduced the fundraising abilities of the Marijuana Party; specifically, the elections law was amended so that most of the Marijuana Party's political contribution tax credit scheme was criminalized.

In the Nunavut riding, however, the party's candidate won 7.88% of all ballots cast and finished in fourth place, ahead of the Greens.

In June 2018, the party's leader, Blair Longley, addressed concerns about Canada's cannabis legalisation plans, referring to it as 'prohibition 2.0’.

In relation to this Longley brought up some of the varying restrictions across the country, such as landlords in Alberta and Nova Scotia being granted permission to ban cannabis use and cultivation on their properties and Calgary's city council passing a bylaw prohibiting pot consumption in public.

There are also concerns about restricting sales to government-run monopolies, which favours large producers and makes it very difficult for small businesses in the market.

[6] Critics have concerns about the stake of producers and private companies, such as owning patents to names and genetic strains.