Marriage usually involves giving two packs of cigarettes, and giving one pack of cigarettes is also acceptable. However, it is generally said that good things come in pairs, so two packs are usually better, and happy events always have a good omen. If the wedding car is rented and the driver who drives the wedding car is hired together with the rental, the owner may not give cigarettes. If the host wants to bring good luck and let the driver share the joy together.
If the wedding car is your own and you ask a friend to help you drive it or borrow it from a friend, you can give a red envelope ranging from 500-1000 to your friend and the driver as a thank you, and also pair it with a whole pack of cigarettes to express your gratitude. Whether your friend accepts it or not will be discussed separately.