A young man smokes a marijuana joint at the Vancouver Art Gallery during the annual 4/20 day, which promotes the use of marijuana, in Vancouver, British Columbia in this file photo taken April 20, 2013. Young, casual marijuana smokers experience potential
A young man smokes a marijuana joint at the Vancouver Art Gallery during the annual 4/20 day, which promotes the use of marijuana, in Vancouver, British Columbia in this file photo taken April 20, 2013. Young, casual marijuana smokers experience potentially harmful changes to their brains, with the drug altering regions of the mind related to motivation and emotion, researchers have found. REUTERS/Ben Nelms/Files REUTERS/Ben Nelms/Files

After a five-year stint in a US jail, Canada's self-declared "Prince of Pot" Marc Emery has returned to his homeland. The first thing on his agenda back home is to hold a rally in Toronto to press for the legalization of marijuana.

Emery said legalizing the use of marijuana in Canada will ensure some 3 million Canadians over its security as well as their health and well-being. Legalizing the cannabis would mean sellers are bound to maintain transparency regarding the origin and quality of marijuana.

"The best, purest quality material like that is made with solvents and butane and that needs to be done under very good, safe circumstances and a legal environment would ensure that would happen," Toronto Sun quoted Emery said.

Emery was arrested in 2009 and pleaded guilty in 2010 to selling marijuana seeds across international borders to U.S. American customers. Reports said his total sales was nearly $3 million. Half of that money or $2.1 million was donated to legalisation efforts in the US, Emery said. Since then, marijuana has been legalized in several American states.

A native of London, Ont., he was sentenced to five years imprisonment in September 2010.

Having completed his jail time, he was back on Canadian soil on Tuesday to the warm welcome of supporters.

Marc Emery has arrived to a huge crowd in Windsor pic.twitter.com/EOREResU4b

— Allison Jones (@allisonjones_cp) August 12, 2014

"I'm glad to see I've got friends," CTV News quoted Emery. "It's really touching, actually."

He urged the crowd to vote in the upcoming Canadian elections in 2015, moreso since wife Jodie plans to run for the Liberals. Party leader Justin Trudeau highly supports legalizing marijuana.

"I do believe that they are sincere that they will legalize marijuana," Emery said. "I know it's the most uncool thing in the world to have to say, especially to young people, that voting is the answer, but it is. It absolutely is."