The phrase "huge culprit" means someone or something that is mostly responsible for a bad outcome or problem.
Sentences with «huge culprit»
While over-stuffing seems to be a great solution to leaks, depending on the style of the diaper and it's fit on your child, it can be a huge culprit for leaks. (clothdiapergeek.com)
Since then, I've still had my ups and downs... breastfeeding was a huge culprit as well in the hormonal cocktail that spikes my anxiety. (birthwithoutfearblog.com)
Electronics are a huge culprit today for sleep. (swanling.com)