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Young people with friends who vape are 15 times more likely to use e-cigarettes, and more adolescents are turning to illicit cannabis products, University of Queensland research has found.

Researchers surveyed over 1,000 university students and found that lactose intolerance, especially when accompanied by gastrointestinal symptoms, is linked to more frequent nightmares and poor sleep. Only a small minority reported that food affected their dreams, highlighting a specific risk for those with food sensitivities.

Quitting smoking is linked to greater long-term waist circumference gain, but this effect may be due to shared genetics rather than quitting itself. Increased physical activity consistently helped limit waist expansion across all genetic backgrounds.

Researchers have recovered and sequenced Mycobacterium lepromatosis genomes from 4,000-year-old human remains in Chile, providing the first molecular evidence of ancient leprosy in the Americas. The findings reveal the deep evolutionary roots and complex spread of Hansen’s disease long before European contact.