Singaporeans are flocking across the Causeway, not for cheap petrol, but for the chance to finally look as dead on the outside as they feel on the inside.

Local authorities are on high alert as "Zombie Drug" vapes hit Johor Bahru, though commuters on the North-South line already display the glazed eyes and slack-jawed gait of a fentanyl enthusiast.

"I didn't even know I was on drugs," said one marketing executive who has been staring at a blank spreadsheet for 48 hours.

"I thought this was just the standard vibe of working for a local SME."

The drug’s ability to cause total muscle paralysis and a vacant stare has made it a hit among husbands forced to spend four hours at a Don Don Donki.

Customs officers at Woodlands Checkpoint have reportedly stopped several individuals, only to realize they weren't smuggling, just suffering from severe sleep deprivation and a complete lack of personality.

The Ministry of Health warns that just one puff can turn a functioning citizen into a shambling husk, a state previously only achievable through a 30-year career in the Civil Service.

Meanwhile, JB sellers are rebranding the substance as "Late Night OT Juice" to appeal to the lucrative Singaporean market.

One seller noted the "zombie" effect is a major selling point for parents who want their children to sit still without an iPad.

It’s the perfect high for a nation that forgot how to feel.