The Open Mouth Inhale...
is another very popular trick in the smoking fetish community/smoking fans. A close "cousin" to the french inhale, in my opinion, it does rate very high on the "sexy" meter.
Jessica of 1000 Cigarettes is one of the best at this trick and, from what I have seen on her site, seems to kind of specialize in this trick.
If it were me rating the smoking tricks, as neat as OMI's are, they would still be behind thick exhales, nostril exhales, and french inhales...but, that's just me. They're all good.