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This is a ‘slippery slope’ fallacy, and your example even demonstrates its unlikelihood.That's the point. Change happens either through a revolution or a "slippery slope". You can call it a fallacy all you want, but think about how successful political change happens. Almost every instance starts small and keeps pushing the boundaries until the political change has happened. This is how you change people's values, so calling it a fallacy as though that's supposed to invalidate it isn't enough.
>And I don’t know of a country where smoking is entirely banned.
It has just been made exceedingly expensive, just like alcohol. To the degree that the vast majority of the cost is in taxes.
Furthermore, this is a long process. Just because they haven't been banned yet doesn't mean that it's not going to happen in the future.
>And I don’t know of a country where smoking is entirely banned.
Bhutan and Turkmenistan have banned the sale of tobacco. The aims of some countries, such as Finland, is to become tobacco free.
Countries are also doing things such as banning flavorings of tobacco. So would your argument then be that it's not a slippery slope, because they aren't actually going to ban sugary drinks, they'll just ban sugary drinks with flavorings?