Nicotine oxidation is why e-liquid turns dark brown in the bottle. We read the forced-degradation data on what heat, light and oxidation do to nicotine.
No, the reverse: a Health Canada trial found salt liquids kept 85% of their nicotine to freebase's 74%. The spread inside each format is the real story.
Three archived Health Canada recall notices for bottled e-liquid publish batch codes, volumes and per-flavour nicotine strengths that the brands themselves, in the material we could open, do not print where a buyer can read them.
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Contains nicotine. Nicotine is an addictive chemical. For adults of legal purchase age only — 21+ in the United States, 18+ in most other markets. Not for non-smokers or former smokers.