Researchers stumped by drug addiction paradox

From chocolate and caffeine to nicotine and cocaine, many of our most addictive foods and drugs come from plant toxins. Considering that plants originally developed these toxins to deter herbivorous predators, it’s ironic that humans and other mammals don’t merely tolerate the toxins, but can crave them and even develop dependencies on them.

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<p><a href="http://www.physorg.com/news127559887.html">Researchers stumped by drug addiction paradox</a></p> <p>From chocolate and caffeine to nicotine and cocaine, many of our most addictive foods and drugs come from plant toxins. Considering that plants originally developed these toxins to deter herbivorous predators, it’s ironic that humans and other mammals don’t merely tolerate the toxins, but can crave them and even develop dependencies on them.</p>