Cal. Health & Safety Code § 11706
(a) An individual user of an illegal controlled substance may not bring an action for damages caused by the use of an illegal controlled substance, except as otherwise provided in this section. An individual user of an illegal controlled substance may bring an action for damages caused by the use of an illegal controlled substance only if all of the following conditions are met:
(c) A person entitled to bring an action under this section may recover only the following damages: