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Also known as Nicotine

The nicotine metabolite N-nitrosonornicotine is classified as a IARC Group 1 carcinogen Nicotine in the mouth and stomach can react to form N-nitrosonornicotine (NNN),[1] a known type 1 carcinogen,[2] suggesting that consumption of non-tobacco forms of nicotine may still play a role in carcinogenesis.[3] This suggests that even oral nicotine replacement therapy products could theoretically contribute to cancer risk.

Addiction potential
extremely addictive with a high potential for abuse
Toxicity
estimated oral LD50 of 6.5 - 13 mg/kg in humans
Tolerance
full tolerance rapidly develops with prolonged and repeated use; half after 3 - 7 days; baseline after 1 - 2 weeks

Buccal

Route dataPsychonautWiki

ThresholdLightCommonStrongHeavy
0.2 mg0.5–2 mg2–4 mg4–6 mg6 mg+
07.5 mg
LightCommonStrongHeavy
Onset3–15 minutes
Come-up3–15 minutes
Peak5–20 minutes
Offset1–2 hours
Total45–90 minutes
After-effects2–6 hours
OnsetCome-upPeakOffset

Oral

Route dataPsychonautWiki

ThresholdLightCommonStrongHeavy
0.2 mg1–3 mg3–5 mg5–7 mg7 mg+
08.75 mg
LightCommonStrongHeavy
Onset20–40 minutes
Come-up60–90 minutes
Peak60–90 minutes
Offset2.5–3.5 hours
Total5–7 hours
After-effects2–4 hours
OnsetCome-upPeakOffset

Smoked

Route dataPsychonautWiki

ThresholdLightCommonStrongHeavy
0.2 mg0.3–0.8 mg0.8–1.5 mg1.5–3.5 mg3.5 mg+
04.375 mg
LightCommonStrongHeavy
Onset5–20 seconds
Come-up5–10 seconds
Peak2–5 minutes
Offset1–2 hours
Total1–3 hours
After-effects1–3 hours
OnsetCome-upPeakOffset
Plan when to take Nicotine — see where onset, peak and comedown land on the clock

Source: PsychonautWiki — Nicotine ↗

Fact-sheets from PsychonautWiki. Harm-reduction reference only — not medical advice.