I personally support this plan. Smoking in the UK has already plummeted. A lot of smokers have moved to vaping. Unfortunately, those left are often the ruder ones. Limiting where they cam smoke, or reduce expire for everyone else is a big dead for me.
Additionally, it’s not banning nicotine, it’s banning cigarettes. Vapes have changes the balance on that one. They are less damaging, and cause far less issues with passive smoking. This acts as a pressure relief valve, rather than a blanket nicotine ban. Also, at no point will an existing (legal) smoker go from legal to illegal.
The vape issue definitely needs fixing. A number have found advertising to younger users is a good money maker. Limiting the options here l, without an outright ban would help reduce the harm to children. It wouldn’t significantly affect ex smokers who moved to vaping.
I view it like an over-revved car. Some parts can handle the strain fine, others are over stressed. Depending what aspect you look at, you will get different results.
As the pressure rises, things will start to fail. Some will not cause additional issues, but others will cascade. Predicting when a cascade failure will happen is difficult, however.