> There doesn't seem to be political will to simply ban cigarettes, so here we are.

A simple ban will work as well as prohibition of alcohol did. There will be a black market. Sure, producing tobacco is a bit more involved then producing liquor, but for smuggling there are enough options.

The attempt is to raise prices and do marketing against smoking as well as preventing ads for smoking. So that over time the interest goes down and when looking at numbers of smokers that seems to work in some regions.

Of course tobacco lobby has a lot of money and tries to prevent all measures.

The question still is: will enough useful stuff be included, to make it worth to dig through the slop? And how to tune the prompt to get better results.

That is not C, but a non-standard extension and thus not portable.

Is it commercial if a non-profit sports club uses it to collect member fees?

Is it fornprofit if I use it and somewhere in a small note on my website it has a way to give me a tip?

It's trivial to come up with more such cases.

And you being fine with my usage, doesn't mean I can rely on it.

And then let's go international.

In case of doubt the answer is to avoid it, which can be fine and match the author's intention. However it can be nom-trivial.

The way it is done her ein my European city is that the bus stop is move behind the traffic lights. The bus and the system are in radio contact, thus the position is known. The time the bus needs from current location to the traffic lights on green light can be predicted, thus the system can calculate whether to keep the green light till the bus arrives or turn red, let the crossing traffic go and then turn green for the bus again. The less predictable time of passenger getting off and on (takes time when crowded, wheelchair takes time, but can be fast when nobody requires that stop) is behind the traffic lights, thus doesn't have to go into the calculation.

Of course this has limits on density of traffic lights and traffic isn't fully predictable either, but overall this works quite well, giving busses mostly a green wave.