Fourteen vapes suspected to contain a controlled drug, tetrahydrocannabinol (THC), which is the main psychoactive compound in cannabis, were also found and handed over to the Central Narcotics Bureau (CNB).
Two men and two women aged between 34 and 52 are assisting with HSA’s and CNB’s investigations.
HSA said that more than S$18 million worth of vape products have been seized since January.
The authority warned that the import, distribution, sale or advertising of vape products is prohibited.
Those convicted for the first time over importing, distributing or selling vape products can face a fine of up to S$10,000, a jail term of up to six months or both.
For second and subsequent offences, those convicted may face a fine of up to S$20,000, a jail term of up to 12 months, or both.
The purchase, use and possession of vapes is illegal and carries a maximum fine of S$2,000.
