Dosage is important. This is a generic dose response curve that illustrates the differences between the concepts of therapeutic, toxic and lethal doses. This is NOT the curve for nicotine...it's an illustration.
The Y-axis represents the size of the effects. The x-axis represents the dose. Halfway up the curve is the half maximal response. Please note that the X-axis is always logarithmic on these types of curves. So for this illustration there are several orders of magnitude difference between the different effects. (sorry the image is so big).
When i talk about lack of toxicity, I'm thinking the curve furthest to the left...where there are a range of of therapeutic doses. The the lowest doses in the that range will have little or no effect. The higher therapeutic doses can overlap with doses that have toxic effects. The closer the curves are together, the more toxic the agent is and the harder it is to find an effective dose that doesn't have side effects.
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Interesting yes but not really relevant to nicotine.