Different apples. Cessation vs never starting is completely different.

A lot of young people don't drink anymore anyway tho. It's not as extreme as it sounds.

As someone who's been sober for only 16 months, not sure how I feel about this. It is surely unrealistic.

Apples to oranges. It worked (and works) with the advent of Islam in Muslim lands.

or prohibit going to church or practicing any kind of organized religion? would yield a lot more positive than banning alcohol

Prohibition doesn't work because people want to modulate their consciousness, chemically force-relax, reduce inhibitions, etc. It didn't work before, and it won't in the future. The more things are forbidden, the more taboo and attractive they become.

This banal, smiling, petty authoritarianism sickens me. Bodily autonomy trumps "common good" arguments, and where it somehow doesn't, injustice abides. Society's job isn't to crush individualism in order to create the safest and most financially efficient outcome. Shall we throw everyone in prison for their safety and protection next, and control their diet to ensure maximum healthspan and potential for participation in the labor market?

Rather than banning anything, point out at an early age that cigarettes stink, get you addicted, cost money forever, and cause health problems. Point out that alcohol makes you fat and causes heart problems and cancer. The accept that each person has the right to make a decision for themselves about what risks they're willing to accept to achieve a desired outcome, and that they have to own those consequences.

Don't want to pay for smokers' lung cancer treatment? Then only fund palliative care for smoking-related cancers. Man enough to smoke a pack a day, man enough to buy smokers' insurance. There, now we can live free.

Smokers already more than pay for their healthcare so punishing them further is silly. Not only is their lifetimehealthcare cheaper, because smoking disqualifies you from many procedures and kills most users right around retirement age before the expensive age-related care becomes common, but the sin-tax collected from smokers in most countries is larger than the average lifetime medical care cost.

It's basically taxing people for saving everybody else money.

An interesting point. So over the next ~60 years, the UK has committed itself to having to find a replacement for all the tax revenue that will be lost by eliminating tobacco products. Additionally, the number of people with longer lifespans will increase, necessitating more late-life care delivery through the NHS, which will also have to be funded.

Outcome: this will cost everyone a lot of money. Time to raise the retirement age to 80!

You have conveniently left out the cons and only listed the pros. That's just a comment in bad faith.