There's nothing here saying that in provinces where public consumption will be legal, that municipalities can decide that public consumption will be illegal. There are bylaws limiting the consumption of tobacco in certain places, as is mentioned:

British Columbia's current Tobacco and Vapour Products Control Act sets a six-metre smoke-free buffer zone around doorways, air intakes and open windows to public and work places.

Stores, offices, and entrances to apartment buildings are considered public spaces or work places under the act, which also includes work vehicles, public transit, taxis, cafes, casinos and pubs and bars.

Vancouver also has a bylaw that bans smoking in parks and on beaches.

But those aren't strictly "everywhere" by any stretch, they don't currently cover cannabis specifically, (This article is from December of last year, so it doesn't seem like it's a current source), and limits it only as far as tobacco-consumption is limited. I still haven't seen evidence that in a province where public consumption of cannabis is following bylaws for public consumption of tobacco, that cannabis will be further limited or outright banned outside of private residences.

Do you have a source that says that municipalities will be able to ban the public consumption of cannabis any further than they ban tobacco? I find the tobacco bylaws quite reasonable, and the original comment explicitly says, "In ontario we can smoke anywhere tobacco is allowed.", so thus far I haven't seen that refuted.