Background: Positive affect (PA) is crucial for individuals to cope with the current pandemic and buffer the lingering fears after it. especially for patients with substance-use disorders (SUDs). The current study aimed to explore PA and its related factors during the COVID-19 pandemic in male patients with the heroin-use disorder (HUD) and patients with the methamphetamine-use disord... https://fitnessgravesyardes.shop/product-category/input-devices/