Hello and welcome to the forum
@Flakee. Glad to have you here!
Actually, vaping is
banned in Singapore. That's why you cannot import vaping products and expect them to pass through customs. Customs forwards all vape gear to HSA for disposal (with a warning letter to the purchaser regarding fines).
SG members are forced to buy on the black market or try to buy from your neighboring country with the hope of smuggling products in through customs.
Hopefully your friend has contacts and can help you purchase your first mod/tank, coils and e-liquid.