When people are doing intravenous drug use, it is an extremely bad indication that they are in an advanced stage of addiction and have moved up to the most dangerous drugs available
The cigarette blend is quite contrasting, though without sharp color variations
By avoiding combustion, the whole process sidesteps the primary source of the most dangerous stuff found in cigarette smoke
Le tabagisme: de la clinique au traitement (in French)
Effective alternatives include deep breathing exercises, brief walks in green spaces, stretching routines, or listening to calming music
I think that most of the time, it's because they aren't retrohaling." There's some self-education involved, however, and retrohaling supports that process