I dont understand the point. Nicotine is not a controlled substance, and can be used for other purposes such as pesticides and other smoking cessation products. If you were caught importing nicotine would it even be a crime?
Ive also learned that extracting nicotine from tobacco is actually a very easy process as well, and making it illegal just makes it more valuable and at the same time loss of tax revenue.
And anyone can make a mech mod basically out of a flashlight.
And of course many will simply go back to smoking, but like in the EU, apparently a huge cigarette smuggling operation has cropped up in the ukraine because ppl want cheap cigarettes.
All of these are incredible likely, especially since most of austraila's coast is wilderness as far as i know.