ROFL... prior to vaping, I tried every variety of tobaccoless cigarettes - WOW are they bad. Really bad.
Plus - the interesting part of it all, as I found out much later (and we all know here of course) is that the nicotine part isn't what kills you, the carcinogens come from burning it...
'the burning of many of these substances which changes their properties, often for the worse. Over 4000 chemical compounds are created by burning a cigarette, many of which are toxic and/or carcinogenic. Carbon monoxide, nitrogen oxides, hydrogen cyanide and ammonia are all present in cigarette smoke."
Link
I read most of what's on the Bravo site, none of their studies say what is IN the (additive enhanced) lettuce smoke. It's going to contain some of that nasty stuff for sure like monoxide, nitrogen oxides. It COULD kill you too. Just you won't have the pleasure of getting your NIC on while it does it.
"manufacture of BRAVO Smokes is embraced by three patents. Two cover the methods for changing taste and odor characteristics "
Interesting stuff, food for thought. Vaping still kicks ... though, lettuce puffers don't know what they're missing ;-)