JAMA

Use of electronic cigarettes (e-cigarettes) put teens on the way to become smokers of traditional cigarettes, and they gradually smoke more heavily, according to a new study.

A team of researchers surveyed more than 3,000 school students in the Los Angeles area. Nearly 33 per cent of the 10th-graders admitted that they vaped at least once; while 4 per cent said they used e-cigarettes once or twice in the last month. Five per cent said they vaped more frequently.

Published online by JAMA Psychiatry, a study of Sweden patients suggested that trigger events like exposure to violence were linked to elevated risk of violent crime in the week after the exposure in schizophrenia and bipolar disorder patients and among the ones without psychiatric diagnoses, involved in the study for comparison.