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McKee stressed that this epidemiological study does not prove cause-and-effect because it cant control for a number of other possible factors such as people moving from one state to another between time periods, and the fact that the survey relies on self-reports of alcohol use

What the numbers really mean Modern instruments can detect chemicals in extremely small concentrations

However, keep in mind that most natural materials have shorter effective times than a repellent like DEET or Picaridin
Levy DA, Mika R, Radzyminski C, Ben-Zvi S, Tibon R

Ephedra resembles the amphetamines -- the popular "diet drugs" that were banned in the 1970s -- in that it is highly addictive

[Google Scholar] Gale JD, Houghton LA