For a dozen years or so before I started using e-cigs (Feb. 2011), I made my own cigarettes via the 'stuff your own' method. I notice in the Amazon add that 'customers also purchased' picture of the hnb product + box of king size (hollow) tubes. In my case it was a matter of cost. As well, it set me up for DIY. It was having to go through the preparation to get my satisfaction that helped prepare me some for e-cigs.
That leads me to the question of whether or not one can 'stuff their own' Heet-type sticks. I believe that the
tobacco used in such refills is combined with a PG and/or VG type substance. I'm not suggesting that is all there is to the Heat sticks, but it would seem that perhaps something along those line might keep the financial aspect of hnb useage within reason.
An important footnote: Here in Kentucky, where major groundwork was laid for driving smoking out of the public, taxes were kept minimal on loose 'pipe tobacco.' Discount tobacco stores also kept cigarette 'tubes' in stock, and at a price far below what Amazon is offering next to their IQOS-type device. Some of that pipe tobacco was about halfway between cigarette tobacco and pipe tobacco.
Insight appreciated.