If You’re Still Smoking Weed at 30, Scientists Have Bad News | April 5, 2025

Should You Still Be Smoking Marijuana After 30? New Research Raises Questions

Marijuana is becoming increasingly accepted across the globe. From easing anxiety and managing medical conditions to recreational use, it’s gained a loyal following. But as it becomes more normalized, new research is prompting a thoughtful pause—especially for adults over the age of 30.

A recent Australian study suggests that regular marijuana use past age 30 might have unintended consequences.

What the Study Found

Conducted by researchers at the University of Queensland, the study followed over 8,000 women and 2,000 of their children. The team examined how drug use—specifically marijuana and amphetamines—impacted life outcomes at ages 21 and 30.