Marijuana users more prone to infections after knee, shoulder surgeries 4 years ago
being a heavy marijuana user is correlated with other features that are causal for infection risk, e.g. unhealthy diet, inconsistent sleep, lack of exercise.
FYI, I've smoked weed every day for 44 years straight.
Today, I am at, or near the peak, of my physical health (180 lb, 6'2, daily swimmer), I sleep like a baby and wake up every day at 8 am. And I swim every day.