Most people have a general idea about what a toxin is. Poison. Death. Lethal stuff. A gateway to sickness or the afterlife. Well, to put it scientifically, it's all of these things! A toxin is any substance that has been made either organically or synthetically, (created in a lab by scientists), that has degrading effects on the human body once ingested either through skin, saliva, consumption of contaminated substance, blood, or from a direct injection, (a snake or spider bite).
 So, this sounds bad enough as it is. Below is an incomplete list of effects of poisons in humans.

• Neurological disorders, (Parkinson's, Alzheimer's, depression, attention deficit disorder, schizophrenia, etc.)
• Cancer
• Nutritional deficiencies
• Hormonal imbalances
• Enzyme dysfunction
• Altered metabolism
• Reproductive disorders
• Fatigue
• Headaches
• Obesity
• Muscle and vision problems
• Immune system depression
• Allergies/Asthma
• Endocrine disorders
• Chronic viral infections
• Less ability to tolerate/handle stress

(http://www.healingnaturallybybee.com/articles/toxin10.php)

So, toxins are bad. Sadly though, there's a large amount of toxins in the environment that were made synthetically and an even larger amount made naturally. What's somewhat scary is the fact that these toxins are in everything. EVERYTHING. 77,000 chemicals are produced annually in the United States as of 2012, 10,000 of which are put into food preservatives, 3,000 of which are added directly to food, and approximately 1,000 new chemicals are made yearly!

Be wary of deadly toxins. They're deadly and likely cause death when ingested.