It's important to be honest about the limitations of current research. Most nicotine-and-sleep research has been done on smokers, not vapers. While the mechanism (nicotine) is the same, there are important differences — like delivery speed, nicotine intake patterns, and the absence of combustion products.
| Evidence Dimension | Rating | Why |
|---|---|---|
| Mechanistic understanding | HIGH | Nicotine's stimulant effects, adenosine interaction, and REM suppression are well-understood |
| Human observational data | MODERATE | Multiple large surveys show correlation between vaping and poor sleep, but can't prove causation |
| Polysomnography (sleep lab) data | LOW | Very few sleep lab studies on vapers specifically; most data is from smokers |
| Longitudinal (long-term) data | LOW | Few long-term studies tracking sleep changes as people start or quit vaping |
| Randomized controlled trials | LOW | No RCTs specifically on vaping and sleep outcomes; ethical limitations |
