In the 18-to-25 age group, 32% of the total study population were medically vulnerable for severe Covid-19, and smoking was a large factor, researchers found./Credit:	Shutterstock

In the 18-to-25 age group, 32% of the total study population were medically vulnerable for severe Covid-19, and smoking was a large factor, researchers found./Credit: Shutterstock

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1 in 3 young adults vulnerable to severe Covid-19 — and smoking plays a big part, research finds

One in three young adults is at risk of severe Covid-19, and smoking plays a big part in that risk, according to new research published Monday in the Journal of Adolescent Health.