This is particularly preoccupying first because, whereas parosmia seems to be a positive sign of recovery, phantosmia appears to be a poorer predictor of recovery in the most recent studies in COVID-19 patients [37] as well as in patients with varied etiologies [38] (but see [39] for contradictory findings that occurrence of parosmia or phantosmia has little prognostic value)

14) that can signal the release of neurotransmitters such as dopamine, norepinephrine, acetylcholine, GABA, and glutamate involved in reward pathways, transmission at the neuromuscular junction, and cognition (Figures 2, 3) [Figure 2) [ FIGURE 2 FIGURE 3 Brain imaging studies have demonstrated that nicotine acutely increases the activity in the visual system, PFC, and thalamus which are consistent with activation of the corticobasal ganglia-thalamic brain circuits [Figure 4) [ FIGURE 4 While electronic cigarettes (e-cigarettes) do not produce combusted smoke, they do deliver an aerosol containing nicotine and other tobacco-related compounds [26]
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Toxicity assessments included in vitro , in vivo , and systems toxicology studies
In fact, smoking damages nearly every organ in the body