During adaptation to use of fire Pre-human and Human inhaled smoke for 2.5 million years. Smoke from fire fumigated environment of human habitat, let rid of parasites and created new micro floral makeup, rebuild immune system, impacted on physiology (loss of hair/fur cover, exposed skin as the new organ) and cultural behaviour. Addiction to fire, its’ light and heat lasted till mid-20th century. Spread of the habit to smoke tobacco coincided with introduction of electricity and decline of natural smoke of fire in environment. Inhaling of smoke is anthropologically normal.
When we 2.5 million years (only proven time) were living with smoke and somebody tells you “it is not good, please stop”, remember that consequences should be same as – if you did not inhaled smoke for 2.5 million years - and somebody today tells you “smoke and inhale smoke”.
Blind paranoia can kill.