There is mounting evidence accumulating that "a second wave" linked to rising rates of mental health and substance use disorders could be building, according to an article published Monday in the medical journal JAMA. … This second mental health wave, the researchers suggested, will bring further challenges, such as increased deaths from suicide and drug overdoses, and will have a disproportionate effect on the same groups that the first wave did: Black and Hispanic people, older adults, lower socioeconomic groups and health care workers.