California Poppies are not Papaver, and therefore do not contain any of the familiar alkaloids that are present in strains such as the Somniferum.

According to American folk medicine herbals-they were used by the native americans-the sap for toothache-tea for colic in babies-used for mild pain as a tea or soaked in hot water then used as a compress.

Used by pioneers to treat insomnia, nervous disorders, pain, muscle spasm. Also a diuretic because of its affect on cramping pain, water retention and anxiety. It was used by women for menstrual distress.

It has been suggested that it can be smoked as a legal sort of high, but it is unlikely that you will get any noticable effect.