When I started working, people smoked everywhere - in the workplace, on trains and buses, in restaurants, cinemas, supermarkets ... parents with children, a baby in one hand and a cigarette in the other. It was normal.
When the 2007 smoking in public places ban came into force, smokers were furious. Gradually though, it became normal.
These days, it would be unthinkable for someone to smoke in the workplace or any indoors public space. I worked with people who, although initially outraged at not being allowed to smoke at work, later said that it actually helped them to quit.
From Cancer Research UK (the most recent statistics I could find online):
Smoking rates in the UK have fallen significantly since the introduction of smoke-free laws in 2007, dropping from approximately 25% of adults (roughly 10 million+ people) in 2007 to around 10.6%–11.9% of adults (approximately 5.3 to 6.4 million people) as of the latest data in 2024–2025. This represents a reduction of nearly 2 million smokers within the first decade after the ban, with the decline continuing to the present day.
Over-legislation is certainly not something I would welcome but, sometimes there might actually be a ban which makes sense and, to me, the smoking ban does make sense. The ban due to come in next January, is not aimed at existing adult smokers, it is aimed at young people, those born on or after 1 January 2009 who, hopefully, will have no interest in smoking.