No Stupid Questions

It really depends on the herb but as a general rule you likely cannot. If you are cooking and decide to add double or triple or even 10x the herbs / spices then the recipe suggests you will be fine. The worse case scenario is that you make it taste bad. That being said everything is poison at high enough doses but for culinary herbs that is a huge dose. You will really have to force yourself to eat large enough quantities since it will taste very unpleasant.

There are plenty of other plants that are more dangerous.

You can overdose on water, so I'd say "yes."

Nutmeg can be relatively fast toxic , but it's soo much that the spice taste of it would be terrible overwhelming any food.

But it can relatively easily kill your kidneys.

So never overdo it.

Tamil proverb says

அளவுக்கடந்தால் அமிர்தமும் நஞ்சு

It's emphasizing that even the most potent, life-giving elixir can become poisonous if taken in excess.

Actually a lot of spices contain unsafe levels of heavy metals, so you definitely could hurt yourself with them

Nutmeg is poisonous in high doses and can lead to hallucinations, seizures, and other complications.

You can easily kill yourself with a water overdose (and it's actually fairly common),so yes.

Nutmeg was already mentioned - high doses can easily kill someone, sadly even without hallucinations simply by killing off ones liver and dying an agonizing death a few days later. The same goes for cinnamon, but with a much lower dose.

There are a few more, but I don't want to give people too many ideas.

To make it short: Yes, possible,but it's mostly a very slow death over multiple days that fucks you up really bad and is a horrible way to go.

"The poison is the dose" is a saying for a reason.

Everything is toxic if you eat too much of it

https://en.wikipedia.org/wiki/List_of_herbs_with_known_adverse_effects

The list itself says it is incomplete and I immediately thought of a couple items not listed that have known toxicity issues:

https://en.wikipedia.org/wiki/Perilla_frutescens#Traditional_medicine,_phytochemicals,_and_toxicity

https://en.wikipedia.org/wiki/Ruta_graveolens#Toxicity

I mean, as humans, toxicity isn't a deterrent, it's a selling feature!

Cinnamon can cause permanent damage in high doses.

Other than that and the others mentioned here, probably just old, rotting ones would be bad.

All at once, absolutely, but it's going to take a LOT of most things.

Theoretically, anything is poisonous if you have enough of it. We even get oxygen poisoning by breathing air that is too rich in oxygen for too long.

Licorice is not that common a spice any more, partially because it's toxic at pretty obtainable levels, though people who like the flavor still typically won't accidentally consume a dangerous amount.