shisha= more dangerous than smoking tobacco

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" ...Conservative estimates of the relative carcinogenic properties of shisha smoking and cigarette smoking show that a typical hour long shisha session produces four times the carcinogenic polyaromatic hydrocarbons, four times the volatile aldehydes, and 20 times the carbon monoxide of a single cigarette. Tar levels in shisha smoke also exceed those of cigarette smoke by a factor of more than 20. Charcoal contributes additional toxins to the inhaled smoke, particularly heavy metals such as cobalt, lead, and zinc.
Shisha smoking sessions often exceed an hour, so exposure to toxins is markedly greater than from a single cigarette. However, a typical shisha user does not smoke as often as a cigarette smoker..." (Isted, 2013)

 It is one of the quote from BMJ (British Medical Journal) publication regarding the harmful effect on shisha. People particularly students doesn't aware of the danger since lack of public knowledge about this.

You can read the full article in
http://student.bmj.com/student/view-article.html?id=sbmj.f2327

Please be informed, stay healthy.