All Narcissus (daffodils included) contain an alkaloid poison called lycorine. If ingested it will cause vomiting in humansas well as high blood pressure, headaches, blurred vision, irregular heartbeat and possibly death. Accidental ingestion is due to someone mistaking a daffodil bulb for an onion or shallot.
Another human response is the "daffodil itch" which as a common inflammation of the skin, especially in florist. This is caused by calcium oxalate in the sap, and will produce dryness, fissures, scalines and redening of the hands.
The ASPCA puts out a document which list the different animals and what is toxic to those particular animals. Daffodils are poisonous for all common household pets and livestock.
However, the good news is that there is a chemical called galantamine that daffodils produce. This has been used to combat Alzheimer's disease.
Daffodils have been around many many centuries. In fact daffodils are older than humans. Daffodils evolved sometime in the Oligocene period or Miocene period.
no I am pretty sure that they are not dangerous to humans
Not normally, but Humans are dangerous to them.
Many of the old varieties of daffodils do grow wild along the roadsides, in meadows and around old homes that may be falling down or gone, but the daffodils return each spring. There are some new varieties that do need a bit of looking after, but in general daffodils do well without tending from humans.
no I am pretty sure that they are not dangerous to humans
oil tankers are dangerous to humans by the pollution of the environment
As a radioactive chemical element, technetium may be dangerous to humans.
Ibex are dangerous to humans.
Is It dangerous for humans to get pregnant? NO!
Only as dangerous as their humans.
When humans threaten them or their cubs.
no