You can bring vapes to Singapore Airport, but they are not allowed to be used on the plane.
E-cigarettes are allowed to be carried at Singapore Airport, but they need to comply with the following regulations:
Vapes are restricted to carry-ons only and cannot be placed in checked luggage.
Vapes powered by lithium batteries need to comply with relevant restrictions, and the lithium content of each vape must not exceed 100wh or 2g.
Each person is limited to 15 personal electronic devices, including vapes.
It should be noted that it is illegal to purchase, use and possess tobacco-like products (such as vapes) in Singapore.