Cannabis smoke is formed when the dried leaves, flowers, stems, seeds, and resins of cannabis plants are burned.

  • Cannabis (marijuana) smoke is on the Proposition 65 list because it can cause cancer. Exposure to cannabis smoke may increase the risk of cancer.
  • Cannabis smoke is also on the Proposition 65 list because if a pregnant woman smokes cannabis, this can affect the development of the child. For example, this may affect the child’s birthweight, memory, and attention.
  • Proposition 65 requires businesses to determine if they must provide a warning about exposure to listed chemicals.

What is Proposition 65?

Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. These chemicals can be in the products that Californians purchase, in their homes or workplaces, or that are released into the environment. By requiring that this information be provided, Proposition 65 enables Californians to make informed decisions about their exposures to these chemicals. Read more