TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY
Tobacco plant (Nicotiana tabacum) in flower. This shrub is native to tropical America. The plant produces the toxic substance nicotine, which protects it from damage by insects and grazing animals. Small doses of nicotine produce a pleasurable stimulus in humans, but habitual use leads to addiction.
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