Title makes no sense without the "How" in front of it, as per the cited link.

Character limit? “How often..“

Edit: Link to the study[0] and it's original title: Mutual age-varying influences of binge drinking and cannabis use during emerging adulthood in the NCANDA cohort

[0] https://onlinelibrary.wiley.com/doi/10.1111/acer.70139

Article provides a pseudo scientific association for the obvious. Suggest authors next study hypothesis - Frequent copulation increases chances of pregnancy.