a woman smoking cigarette Smoke signals: from Charli xcx's nuptials to The Bear, cigarettes are everywhere | portrait of attractive girl smoking

At the same time, smoking speeds up the heart rate, necessitating more oxygen

Researchers at the University of California, San Francisco, and University of Alabama at Birmingham knew tobacco smoking causes lung damage and leads to respiratory issues such as chronic obstructive pulmonary disease (COPD), but they wanted to be clear whether smoking marijuana, had similar effects

But some have fallen far below these levels: in Chile and Thailand, the fertility rate was 1.2 births per woman in 2023, and may have fallen even further

Excessive sun exposure, especially at a young age

PMID: 19224852

legalizing medical cannabis, 31 states plus D.C