Justin Trudeau clarified his stance on marijuana Thursday, saying legalizing the drug is a "very responsible thing to look at and to do."

The Liberal leader explained his shift in opinion on the controversial issue during a stop in Vancouver, saying he has "evolved" in his opinion about legalization.

“I have evolved in my own thinking. I was more hesitant to even decriminalize not so much as five years ago. But I did a lot of listening, a lot of reading, and a lot of paying attention to the very serious studies that have come out and I realize that going the road of legalization is actually a responsible thing to look at and to do,” he said, according to the Globe and Mail.

In the past, Trudeau has expressed support for decriminalization, but held back from supporting legalization. In his comments to the crowd at Vancouver's English Bay, he said that isn't enough.

"Decriminalization just removes the criminal penalties that are applied to people for having consumed, or owning marijuana, and that tends to bog down the legal system, and keeps the gangs, basically and the criminal elements that are profiting from marijuana."

"Once we control it, tax and regulate it, we allow for development of a medical marijuana industry, that will actually be responsive to the needs of the many consumers of medical marijuana," he told the crowd.

On Wednesday, the Liberal leader said to a crowd in Kelowna that he was in favour of a "tax and regulate" approach to cannabis to "keep it away from kids."

The Liberal Party voted in 2012 to legalize marijuana. At the party's convention, 77 per cent of delegates voted in favour.

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  • Liberal Leader Justin Trudeau saddles up a horse in a Kamloops, B.C. stable.

  • A Trail, B.C. meets with Liberal Leader Justin Trudeau on July 23.

  • Liberal Leader Justin Trudeau is welcomed to Vancouver by a group of people by English Bay.

  • Liberal Leader Justin Trudeau and wife Sophie Grégoire hold hands in an RV on their tour through interior B.C.

  • Liberal Leader Justin Trudeau had some pancakes made for him by Xavier at Steve's Place in Canal Flats, B.C.

  • Liberal Leader Justin Trudeau takes a ride on the Nelson, B.C. trolley on Sunday with his family.

  • Liberal Leader Justin Trudeau visits Truscott Farms in Creston, B.C.

  • Federal Liberal Leader Justin Trudeau and his family hike to Kokanee Lake, B.C. Trudeau's younger brother, Michel, was killed in 1998 when he was swept into the lake by an avalanche.

  • <strong>NEXT</strong>: What Is Trudeau Doing?

  • Come At Me, Bro

    Justin Trudeau trains at Pan Am Boxing Club in Winnipeg on Friday Feb. 1, 2013.

  • Peekaboo!

    Justin Trudeau & co. making faces.

  • Riiiiip!

    Justin Trudeau splits his pants while pushing the "scrum machine" in support of Prostate Cancer Canada in Toronto Thursday, July 21, 2011.

  • Don't Shoot!

    Justin Trudeau gets his geek on at Montreal Comiccon in September 2012.

  • So Long 'Stache

    Justin Trudeau has his moustache shaved off to raise money for the Judy LaMarsh Fund, that supports female candidates, at the Liberal Party convention in Ottawa on Saturday, January 14, 2012.

  • Coming For MacKay

    Minister of National Defence Peter MacKay (left) is chased by Liberal MP Justin Trudeau in a motorized wheelchair during a wheelchair race relay on Parliament Hill in Ottawa on Wednesday, May 12, 2010. Twenty-five MPs and senators used a wheelchair for the day in support of the Canadian Paraplegic Association's Spinal Cord Injury and CPA awareness month.

  • All For One, One For All

    Justin Trudeau all dressed up for the Montreal Movember Gala in 2010.

  • Get Him!

    Pierre Trudeau's sons, Sacha, left, and Justin, tackle their mother's paperboy in Ottawa in this undated photo.

  • 'Family... And A Cow.'

    'Nuff said.

  • He Can Certainly Take A Punch

    Alexandre (Sacha) Trudeau delivers a right hook to his older brother Justin during a play fight in 1980 at Ottawa airport as the boys await a flight with the return of their father, then-prime minister, Pierre Trudeau.

  • Be Honest With Me, Who's Cuter?

    Justin Trudeau strikes a pose with an adorable baby.

  • A Very Furry Christmas

    Justin Trudeau poses with his family on his 2010 Christmas card.

  • Game On!

    Former Liberal MP Ken Dryden, left, and Justin Trudeau play table hockey as they visit Sun Youth, a community organization, Monday, Jan. 14, 2008 in Montreal.

  • Yanking Their Chain

    Then-prime minister Pierre Trudeau, left, watches as his 11-year-old son Justin swings on a chain during a tour of an old fort in the Omani town of Nizwa Dec. 2, 1983. Trudeau and Justin spent the day visiting the towns of Jebel and Nizwa 165 kilometres south of Muscat.

  • Rocking Out

    Justin Trudeau in Muskoka, Ont.

  • YeeHaw!

    Liberal MP Justin Trudeau, centre, has his cowbay taken by his son Xavier, 4 years-old, while his wife Sophie Gregoire, second from left, holds daughet Ella-Grace, 3 years-old, while they attend the party's annual Stampede breakfast in Calgary, Saturday, July 7, 2012. This is the 100th anniversary of the Stampede.

  • Like Mother, Like Son

    Eleven-month-old Justin Trudeau, urged on by his mother Margaret Trudeau, crawls up the steps of an aircraft in Ottawa on Dec. 5, 1972 to meet his father, then-prime minister, Pierre Trudeau on his return from Britain.

  • Cutting A Rug

    Justin Trudeau dances with wife Sophie Grégoire before his speech at the Liberal showcase on April 6, 2013.

  • Next: What Is Pierre Trudeau Doing?

  • Magician?

    Prime Minister Pierre Trudeau, wearing what someone called his "Mandrake the Magician outfit," walks down the grandstand steps to present the Grey Cup trophy to the victorious Montreal Alouettes in this Nov. 28, 1970 photo.

  • Hey, It Was The '70s

    Pierre Trudeau leans over to kiss an unidentified young lady to the seeming surprise of his recent bride Margaret. Trudeau and Margaret spent Saturday March 27, 1971 at maple tree farm here near Montreal at a sugaring out party.

  • Fur Wasn't Always Controversial

    Pierre Trudeau accompanies Margaret Sinclair, at the annual Governor General's skating party for members of Parliament in Ottawa Jan. 14, 1970.

  • Ditto For Seal Hunting

    Pierre Trudeau looks through the scope of his rifle while on a seal hunting trip in Baffin Island's Clear Water Fjord, July 29, 1968.

  • A Leg Up

    Pierre Trudeau shoes off his frisbee catching style while waiting to board his plane in Vancouver May 16, 1979.

  • Calisthenics Were Still Cool

    Pierre Trudeau had no trouble keeping himself occupied during a break from a boat trip down the Northwest Territories, Nahanni River, Monday Aug. 4, 1970.

  • The Outfit...

    Pierre Trudeau takes a wary look at an ice crevice, decides to chance it and makes the leap successfully during a midnight seal- hunting expedition at Clearwater Fjord in Canada's Arctic, July 29, 1968.

  • When in France...

    Pierre Trudeau receives a kiss from his wife Margaret during a tour of St. Pierre, France, Aug. 1971.

  • Running Man

    Pierre Trudeau in Guayana 1974.

  • Friendlier With Reporters Than You Know Who

    Pierre Trudeau sticks his tongue out to Canadian Press Photographer Peter Bregg during the 1972 election campaign. This photo was taken aboard the campaign plane where such antics were considered off the record. The photo was not made available until after the death of the prime minister

  • Disco Stu

    Prime Minister Pierre Trudeau dances in Montreal Oct. 21, 1979.

  • Acting like a Beatle

    Pierre Trudeau sprints away from a crowd of female admirers in Ottawa April 22, 1968. They surrounded him outside the Parliament Buildings on his third day in office.

  • Posing with a Beatle

    John Lennon and his wife Yoko Ono, meet with Pierre Trudeau Dec. 24, 1969 in Ottawa.

  • 'I See Cigars And Rum In Our Future'

    Pierre Trudeau looks on as Cuban President Fidel Castro gestures during a visit to a Havana housing project in this Jan. 27, 1976 photo.

  • Acting Out A Tory Fantasy?

    Pierre Trudeau pretending to strangle himself with a tie given to him as he was presented with honorary membership in the National Press Club in Ottawa Sept. 17, 1968.

  • Unfortunate Hat

    Pierre Trudeau amuses a group of people in Fortune while on tour through Newfoundland, Aug. 3, 1971.

  • Oh Captain! My Captain!

    Pierre Trudeau takes a ride on the Bluenose, Aug. 1972.

  • Nice Form Pierre

    Pierre Trudeau works out at an Oshawa health club during a break in his 1968 election campaign.

  • Are The Flowers Too Much?

    Pierre Trudeau, with a garland around his neck and a Hindu greeting symbol in paste on his forhead, rides a camel Jan 12, 1971 in the village of Benares, India, where he dedicated a water well.

  • I Do Love Flowers

    Pierre Trudeau kids around with a carnation while waiting for voting results at the Liberal convention in this April 7, 1968 photo.

  • Indiana Jones Of The Great White North

    Pierre Trudeau tries cracking a dog sled whip while visiting Baker Lake in the Arctic, March 10, 1970.

  • Never Afraid To Dance

    Saudi Arabian Oil Minister Sheik Yamani, left, and Pierre Trudeau, right, dance a traditional Arabian dance while camping out in the desert in Madein Saleh, Saudi Arabia, Nov. 18, 1980.

  • Or Rock A Skirt

    Pierre Trudeau, seen here taking part in Maori ceremonial dance in Wellington, New Zealand May 13, 1970.