In tobacco cigarette, there is combustion, a burning of an organic material that generates temperatures up to 900 degree Celsius. Chronic exposure to this tends to thicken blood vessels, making them weaker in the long run. This can lead to blood clots and ultimately result in stroke or peripheral heart diseases.
World Health Organisation(WHO) states that of the seven million lives that tobacco claims worldwide each year, almost 900,000 are passive-smokers.
Tobacco, whether smoked, swallowed, or chewed poses multiple hazards. In addition to affecting the lungs and heart, it also increases the risk of head and neck, lung, esophageal, pancreatic, and urologic cancers.
Smoking could directly damage the muscles by reducing the number of blood vessels in leg muscles, which in turn reduce the amount of oxygen and nutrients the muscles receive.
This may impact the metabolism and activity levels.
Male smokers can suffer from decreased sperm quality with lower mobility and increased numbers of abnormally-shaped sperms.
Moreover, chain smoking might also decrease the sperm's ability to fertilise eggs.
Besides causing infertility, tobacco during pregnancy can also lead to multiple issues ranging from miscarriage to under-development of the foetus and making the child susceptible to various forms of disorder such as Attention Deficit Hyperactivity Disorder (ADHD)
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