I'm kinda surprised how long it's taking them. Summer effectively over, and as far as I can tell, IQOS still isn't being sold. I'd have thought with as long as it took the FDA to approve that PMTA (over two years) that Altria would be ready to go the moment they got the green light.
I guess the reason you 'paged' me is you remember that I bought an IQOS kit at an airport Duty Free Shop on the way back from Europe last year. Like the Juul I bought back in 2015, this was a "curiosity" purchase. It's been almost a year since then. I've gone through less than 2 packs of the heat sticks during that time. I'll still have one, once in a blue moon, when I'm in the right mood. They definitely produce a different "head" than vaping straight nicotine does; much more like I remember actual smoked tobacco. The downside is they taste just about as nasty as a real cig though. So I do not think we'll see a whole lot of vapers switching to IQOS, but I do see potential for harm-reduction among people who haven't taken to vaping.