Because the non-tobacco products (i.e. vaping) are worse than even cigarette smoking. 2024 saw the release of 2 studies: In Korea cigarette smokers quitting vs. those continuing vs. those switching to e-cigarettes. After 5 years risk ratios were 1.0 vs 1.5 vs 1.65.
Another study compared cigarette smokers to those smoking cigarettes and vaping. relative risk ratio 4.0.
Those are incredible numbers and cannot be explained by harmful substances in vaping. Prior studies on radon exposure, particles in indoor air after smoking cigarettes and e-cigarettes and heated tobacco products make it clear, that the missing link is the radon. Yes, the effect is well known in science, but it was highly underestimated and probably causes >50% of the bad outcomes regarding lung instead of just 7%.
Cigarette smoking always had the conundrum that every health-related issue was dose dependent except the lungs. Very few cigarettes per day, bad outcome, one pack a day, not that much worse, you really have to smoke several packs per day to further increase the risk. Radon synergistic effect with particle emission after indoor smoking explains it.
Interestingly pipe smoking is mostly not burning tobacco, but a dry destillation at 100-300 degrees Celsius. It is known since the 1950s when a paper on burning temperatures of cigarette, cigar and pipe smoking came out.
That means pipe smoking is very similar to the modern heated tobacco products: 1/3 the harmful substances per same amount of tobacco and nearly no particulate matter emissions (+30% in heated tobacco vs 30x increase in cigarette smoking), and so no radon link.
From least to most dangerous for our lungs
1. Pipe Smoking (study over 26 years from 1985-2011 in US shows +50% risk)
2. Heated Tobacco (no data, but 350 degree temperature very similar to effective pipe temperatures + the smoke is inhaled)
3. Cigarette Smoking (same study as for 1 shows +1100% risk increase)
4. Vaping (no clear data, but shown to increase alpha radiation particulate matter indoors worse than cigarettes + 2 studies I mentioned above showing higher risk for lungs than cigarette smoking)
Now the UK starts to outlaw products 1 - 3, but the *worst* alternative, no. 4, will become their only alternative.
Considering that one of the few studies of reasonable size and duration, the one I linked in my prior post, shows mortality rates compared to non-smokers over 26 years to be 2x for cigarette smokers, 1.2x for cigar smokers 1.09x for daily pipe smokers and 0.64x for non-daily pipe smokers, a resonable solution would be to smoke less in general, more cigars and more pipe, and not to outlaw all tobacco products while pushing future generations to even worse products than cigarettes.