Health officials confirm 64 people were admitted to hospital Monday in connection with the 4/20 marijuana celebration in downtown Vancouver.

Providence Health Care said the revelers, some of whom consumed edible pot products, were taken to St. Paul's Hospital on Burrard Street and treated for symptoms including nausea, dizziness and vomiting.

Some of the patients were put on IVs or given a drug similar to Gravol, and many were released shortly after arriving in hospital.

Spokesperson Dave Lefebvre said the patients were all treated and released.

Nearly 25,000 took part in the rally at the Vancouver Art Gallery, which culminated in a mass "smoke out" at 4:20 p.m.

Upwards of 200 vendors were selling everything from marijuana to pot-laced edibles, including popcorn and THC-laden lollipops. Free weed was given out as prizes for best pot plants and pot posters, according to sponsors.

Vancouver police say traffic was disrupted on Howe, Hornby, Robson and West Georgia streets as the crowds swelled later in the day but "there were no significant police incidents of note."

"Public safety remains our primary concern for the event," Sgt. Randy Fincham said in an emailed statement to CTV News.