"It's basically harmless"

I'll keep this chapter short, because the book isn't a health lecture and because the honest position is a narrow one.

Here's what the NHS says, and I'm going to quote its sense closely. Vaping is less harmful than smoking. It exposes you to fewer toxins at lower levels, and switching reduces the exposures that cause cancer, lung disease and heart disease. A 2022 review of the international evidence by UK experts found that in the short and medium term, vaping poses a small fraction of the risks of smoking. That's the good news, and it's very good if you used to smoke.

The same page says three more things. Vaping is not risk-free. It hasn't been around long enough to know the long-term effects, and it's unlikely to be totally harmless. And the healthiest option is not to smoke or vape, so if you're vaping to stop smoking, you should aim to stop vaping too.

That's it. That's all the health case I'm going to make. Less harmful, not harmless, long-term unknown, aim to stop. I'm not going to list chemicals or tell you what a study found in mice, because I don't think it's what's keeping you vaping, and I don't think a scare would stop you if it were.

The common side effects the NHS lists are coughing, dry mouth and throat, irritation, shortness of breath and headaches. If you've got any of those, it says to get advice from an adviser or a specialist retailer before you stop using a vape as a way to stay off cigarettes, because small changes to the product usually fix them. I'd add only that "dry throat" and "a bit of a cough" are things a lot of all-day vapers describe as normal, and they weren't normal before.

So the argument of this book isn't the health one. It's about dependence, and about the reach. Even if vaping turned out to carry no long-term harm at all, you'd still be a person whose hand goes to their pocket two hundred times a day to reverse a fall the last draw created, who can't sit through a film without it, who wakes at three to have one. That's worth changing on its own terms. The health question is real, but it's the smaller reason, and I'd rather you changed for the larger one.