"…school also lied about the dangers of Ecstasy. Leah Betts' actual cause of death was water overdose, but she was the literal poster-child for the anti-drugs campaign in my time."

In the wash-up I reckon our views are likely closer to each other than it first seems. I agree completely with you being indignant about being lied to at school.

The whole matter of drug education I reckon is in an unholy mess. However, it's difficult to blame anyone in particular because there are so many factors involved and almost every one of them is complicated by multiple factors. I don't envy anyone involved in setting policy in this area.

There are social and moral issues involved not to mention that both schools and parents often have little factual knowledge about drugs, drug taking, addiction, and likely most have no personal experience of drugs having never taken them, etc. This itself is a major problem.

Thus, often the information they impart to kids comes more from emotion than from actual fact. This often misleading information is also the source of why there are so many views and why it's so difficult to reach a common agreement or consensus.

No doubt both teachers and parents want to keep their kids safe, so they'll tell kids what they think is necessary whether it's correct or not, and they'll do so without due consideration or whether it's prudent to even raise certain matters.

Therefore, it's sort of understandable that teachers, schools and parents lie to kids about such matters. Nevertheless, I strongly believe that lying to kids doesn't pay off as in the long-term it has negative consequences (and I'd reckon that's especially so when it comes to information about drugs).

In my opinion, misinforming kids is a serious matter for whatever reason.

My views and opinions about this go back a long way and owe their origins to an incident that happened when I was very young. (Fortunately it wasn't about drugs because there weren't† any around when I was growing up decades ago, we kids were very lucky in that regard.)

The incident occurred before I'd started school when my mother took me to see a matinee and during the newsreel there was a news clip about cancer and cancer research. Later when I asked her about it, so as not to worry me she told me that cancer was a very rare disease and that I'd never have to worry about it. She also failed to tell me that one of her sisters died of cancer before I was born. So a woman who would have been my aunt died of the disease. Now that's damn close to home I reckon.

It all unraveled a couple of years later when I was about 7 or 8 when I was on holidays at my grandmother's place. Her next-door neighbor was dying of lung cancer and it was my grandmother who told me so—not my mother. That's when I found out my mother had lied to me. I never mentioned to my mother what my grandmother had told me—and I've never forgotten that I was lied to.

We adults almost always underestimate how intelligent kids really are and the moment they get a whiff that they've been hoodwinked is the moment when mistrust first sets in. In my opinion that's really bad, especially so early on because the earlier things are imprinted into kid's minds the harder they are to shift later.

Back to the matter of your sensitivity to caffeine, these issues arose again in another current story that you may be interested in under HN title A chemist explains the chemistry behind decaf coffee (it's not the actual story title): https://news.ycombinator.com/item?id=41067616.

I've made several posts here but the one that's probably the most relevant to you is this: https://news.ycombinator.com/item?id=41076191

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† Thus, we had no instruction about drugs at school except to be told that if we were caught smoking we'd be in trouble (especially so if anyone was caught doing so at school). And several were caught, they'd sneak off and smoke behind the toilet block down the end of the school yard. BTW, I wasn't one of them (and I don't smoke).