Systematic review of tobacco smoking prevalence among young people in treatment for first-episode psychosis

To determine whether smoking prevalence in first-episode psychosis (FEP) is different than in people with established psychosis in long-term treatment. A systematic review of cross-sectional, case–control and cohort studies identified from searches of PubMed, Embase, CINAHL and PsycINFO up to 12 August 2023. 20 studies out of 2773 screened titles were included. There was no clear pattern of smoking by diagnosis as smoking rates in people with FEP ranged from 43% to 78%, while in those with established psychosis, it ranged from 19% to 76%. The wide range of smoking levels in both populations precluded conclusions as to whether smoking rates are different between people with FEP and established psychosis suggesting that factors other than the time course of the illness influence smoking levels.