cigarettes effects on the brain Study shows smoking likely leads to shrinkage The Brain on Nicotine (Image:

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Tobacco is one of the biggest causes of preventable deaths in the world, killing more than 8 million people worldwide, annually

Methamphetamine can cause adverse effects to many organ systems including the brain and nerves, gastrointestinal tract, heart, lung, kidney, muscles, skin, bones, and urinary tract

Endokrynol Pol 36(5): 263-269, 1985

Joseph DiFranza, who leads the research at the University of Massachusetts, said the findings were very important to warn kids that they shouldn't fool around with cigarettes or experiment with them as playing around with it for weeks could lead to a lifetime addiction