Passive smoking is when someone breathes in the combination of: Smoke exhaled by a smoker + Smoke from the end of a burning cigarette or cigar. This smoke is also referred to as second-hand smoke or environmental tobacco smoke. The Effects of Passive Smoking. The scientific evidence about passive smoking shows us just how dangerous second-hand smoke really is. Here are the facts about passive smoking: Non-smokers exposed to second-hand smoke have an increased risk of lung cancer; Non-smokers who live with a smoker are 20-30% more likely to develop lung cancer
The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. Hormones are chemicals that control body functions, such as metabolism, growth, and sexual development.
1 Rate of production: Synthesis and secretion of hormones are the most highly regulated aspect of endocrine control. 2  Such control is mediated by positive and negative feedback circuits, as described below in more detail.