If you’ve got it Thorazine, just like if your character is schizophrenic. My preference though is to hole up in a safe place and do some book reading or crafting while I wait for the hallucinations to wear off. Even if you’re out in the open a lot of hallucinations are obviously not real, an irradiated walker didn’t show up when you’re obviously not in the necropolis, a fungal tower didn’t just suddenly appear in the middle of the street, NPC followers are dumb but not going to ignore enemies that are attacking them, etc.
Eat one, your characters asthma attack ends. But you do have to deal with all of the other effects of the datura. Inhalers or oxygen tanks are prefered obviously but in much shorter supply than datura seeds.
Edit: I wonder if it’s stim level related. I’m going to try doing a line of coke next time my character has an asthma attack and see if that works too. I know in real life it’s said that a cup of hot coffee can offer some relief if you don’t have access to your inhaler so it might actually be tied to stim in the game.