[samcday]

I don't think this is at all analogous to speech. For example, you might be entitled to say whatever you want under free speech protections in the US, but that doesn't mean you're allowed to walk up to random people and shout in their face. If you do that long enough you'll definitely earn yourself some misdemeanors. If you consistently did it to a particular person against their wishes, you'd eventually get some kind of harassment felony charge.

[joenot443]

At the risk of being pedantic, I think the free speech analogue is still valid. You would likely receive the same harassment charge if you were purposely walking up to strangers and blowing smoke in their face. Here in Canada, there are no laws which prevent you from standing on the street corner preaching whatever you like, just like you're allowed to smoke tobacco on the street corner.