A woman smokes a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman waves flags on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man smokes a bong and a cigarette on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio TPX IMAGES OF THE DAY

A woman dances with a man with lights on his gloves on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man waves a flag on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman blows bubbles on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Customers stand in line outside a Cannabis Yukon retail store, as Canada became the first industrialized nation to legalize recreational marijuana, in Whitehorse, Yukon, Canada, October 17, 2018. REUTERS/Crystal Schick

A man reacts as he exits a Cannabis Yukon retail store with his purchase while others wait their turn to enter as Canada became the first industrialized nation to legalize recreational marijuana, in Whitehorse, Yukon, Canada, October 17, 2018. REUTERS/Crystal Schick

People smoke on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman smokes a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man dances with a marijuana flag on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man lights a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People contribute cannabis for a communal joint on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man smokes a bong and a cigarette on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People smoke on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People smoke on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A joint with a maple leaf design on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman smokes a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman smokes a bong on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People smoke on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People smoke on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People smoke on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man shows off his cannabis purchase outside the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi TPX IMAGES OF THE DAY

People look to purchase cannabis products at the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People look to purchase cannabis products at the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A woman lights a joint on the day Canada became the first industrialized nation to legalize recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man takes a selfie with a joint on the day Canada became the first industrialized nation to legalize recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A man smokes a joint on the day Canada became the first industrialized nation to legalize recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman waits to purchase cannabis products inside the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A woman lights a joint on the day Canada became the first industrialized nation to legalize recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman holds a joint on the day Canada became the first industrialized nation to legalize recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People smoke on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Dan Thompson (left) and her partner, Nick Frankruyter, share a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

A woman and her baby pose for a photo with "Toke-a-roo" on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Dan Thompson (left) and her partner, Nick Frankruyter, share a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Anna Sapershteyn smokes on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Dan Thompson (left) and her partner, Nick Frankruyter, share a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People dance on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Anna Sapershteyn rolls a joint on the day Canada legalizes recreational marijuana at Trinity Bellwoods Park, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Hugo Senecal, reacts as the doors open at the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People smoke on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man shows off his cannabis purchase outside the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man gives a thumbs up sign as he enters the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man smokes as he waits in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

Health Canada approved cannabis packing is seen on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Health Canada approved cannabis packing is seen on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Health Canada approved cannabis packing is seen on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Health Canada approved cannabis packing is seen on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Health Canada approved cannabis packing is seen on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

Leafly holds an education pop-up event on the day Canada legalizes recreational marijuana, in Toronto, Ontario, Canada, October 17, 2018. REUTERS/Carlos Osorio

People wait in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People wait in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man shows off his cannabis purchase outside the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People wait in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

Hugo Senecal, who had been first in line at the Quebec Cannabis Society (SQDC) store, smokes a joint, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A man smells his cannabis purchase outside the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada October 17, 2018. REUTERS/Christinne Muschi

People smoke on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

People wait in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada October 17, 2018. REUTERS/Christinne Muschi

People wait in line for the opening of the Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec, Canada, October 17, 2018. REUTERS/Christinne Muschi

A couple holds a flag as they wait in line for the opening of Quebec Cannabis Society (SQDC) store, on the day Canada legalizes recreational marijuana, in Montreal, Quebec October 17, 2018. REUTERS/Christinne Muschi