You may find these links interesting. 

(The advice given in them could be the basis for 'the ad campaign' suggested in the last update and in which the government tells NZ the truth about vaping risks, and provides advice on how to quit both smoking and vaping.)

How to overcome nicotine addiction from 2 of the most respected clinics in the US. A brief insight into withdrawal, peak times of symptoms, how to ride through these, when you start to feel better. 

https://my.clevelandclinic.org/health/diseases/21587-nicotine-withdrawal

https://www.mayoclinic.org/healthy-lifestyle/quit-smoking/in-depth/nicotine-craving/art-20045454

Note: NRT(nicotine replacement therapy) is included as one of the strategies, with a protocol of gradual dose reduction, but NRT is not safe for children or pregnant women and some others, just as vaping isn't..