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This significantly reduces the surface area available for oxygen to enter the bloodstream, making it harder to breathe

"We ask, 'Do you feel addicted?' And they say no, but a series of questions on a validated scale for assessing loss of autonomy over nicotine show that they're dependent," said the study's lead author, Karma McKelvey, PhD, a postdoctoral scholar

And here's why, according to the study: Many adults who smoke weed daily or almost daily started it as teeenagers

This may be because of nicotines effect on blood flow and in turn blood supply to the penis

Disclosures The author is a member of a speakers' bureau or advisory board for Astra Zeneca, Behring, Boehringer Ingelheim, Covis, Cipla, GSK, Novartis, Pfizer, Purdue, Sanofi, Spectrum, Teva, Trudel