Another 44 percent are left feeling overwhelmed by their repayments, according to a poll of 2,000 UK consumers who have used BNPL products.

It also emerged 12 percent of 18- to 24-year-old BNPL users have seen their credit score impacted, and half regret using unregulated BNPL altogether.

A separate poll of 2,000 parents with grown-up children also found 66 percent are concerned about them using BNPL, with over three-quarters (77 percent) supporting calls for tighter regulation of the sector.

And among parents whose grown-up children have already used BNPL, more than a fifth (22 percent) have had to bail them out.

Antony Stephen, CEO of Barclays Partner Finance, which commissioned the research, said: “Rising inflation and energy bills are contributing to the growing cost of living crisis.

“This makes it much harder for consumers, particularly those in financially vulnerable groups, to stay on top of spending, and many are drawn to BNPL as a way to maintain their current lifestyle.

“As things stand, newer BNPL products are not subject to the same regulation as more traditional credit agreements.

“With many providers, consumers are not even given a detailed affordability assessment, and the credit reference agencies are given no visibility of the loans that are dished out.

“That’s a problem, because it allows consumers to get into unmanageable and overwhelming levels of debt – an issue that our research shows is hitting Gen Z shoppers particularly hard.”

The research found nearly seven in ten (68 percent) 18-24-year-old users of unregulated BNPL products have racked up debts across multiple providers simultaneously.

And 59 percent of those had agreements in place with three or more providers at the same time.

Unregulated BNPL providers are not required to report loans to the Credit Reference Agencies, which means these multiple BNPL loans are not currently visible to other credit providers to factor into their own affordability assessments.

This can result in further credit being extended to a consumer already struggling with debt, compounding the problem.

Debt charity StepChange has voiced concerns over the impact of BNPL on younger consumers, and echoes call for more robust and consistent regulation.

Richard Lane, director of external affairs at the charity, said: “All credit carries an inherent risk of debt for consumers, but on regulated credit those risks are mitigated through stringent rules about advertising, affordability assessments, and treating customers fairly.

“At present, despite the positives that BNPL can offer, the sector still remains outside those rules, and that increases the risk of consumer harm.

“It’s particularly worrying that young people with less financial experience to draw upon are becoming such widespread users of unregulated credit.”