A study of 637,000 adolescents found that cannabis use disorder diagnoses began climbing after recreational cannabis was legalized in California in 2016, reversing a steady decline in the three years prior. The researchers say their findings call for disorder-level outcomes to be tracked alongside standard measures of use prevalence an...
A new study found that 2.5% of intoxicating hemp posts on Instagram carry health warnings, despite the majority using youth-oriented marketing tactics. Researchers analyzed 837 posts from nine brands and highlighted the need for stricter regulations to protect young audiences.
A large new study published in JAMA Health Forum found that past-year cannabis use during adolescence is associated with a significantly higher risk of incident psychotic, bipolar, depressive, and anxiety disorders. Cannabis use preceded psychiatric diagnoses by an average of 1.7 to 2.3 years.
A study of 780,225 Veterans found that protection against COVID-19 declined by 38.8% from February to October 2021 for all vaccine types, with overall vaccine protection declining from 87.9% to 48.1%. Vaccination remained protective against death in those who became infected during the Delta surge.
A new study found that granddaughters whose grandmothers were exposed to DDT have higher rates of obesity and earlier first menstrual periods. This may increase the granddaughters' risk for breast cancer, high blood pressure, diabetes, and other cardiometabolic diseases.
A six-decade-long study found that all women exposed to high levels of DDT before age 54 are at increased breast cancer risk. The timing of first exposure matters, with early infancy and puberty linked to premenopausal cancer and later childhood and adolescence to postmenopause diagnosis.