Beginning on July 1, 2024, Cal. Bus. and Prof. Code § 26152.1 took effect, stating:

An empty integrated cannabis vaporizer shall be properly disposed of as hazardous waste at a household hazardous waste collection facility or other approved facility. A spent cannabis cartridge shall be properly disposed of as hazardous waste at a household hazardous waste collection facility or other approved facility. An "integrated cannabis vaporizer" is defined as: "a singular device that contains both cannabis oil and an integrated electronic device that creates an aerosol or vapor." “Authorized facility” means a facility authorized under the hazardous waste control laws under Chapter 6.5 (commencing with Section 25100) of Division 20 of the Health and Safety Code.

Find an authorized hazardous waste facility

Also see: How to Dispose of Vape Pen Batteries