Hiii I am hussain vora An electronic cigarette or e-cigarette[note 1]is a handheld electronic device that vaporizes a flavored liquid. The user inhales the vapor.[2] Using e-cigarettes is often called vaping.[4] The fluid in the e-cigarette, called e-liquid, [5] is usually made of nicotine, propylene glycol, glycerine, and flavorings.[2][6][7]
The health risks of e-cigarettes are uncertain.[8][9][10] While they are safer than tobacco cigarettes, [11][12] the long-term health effects are not known.[6][13][14][15][16][17][18] There is evidence they can help some people quit smoking[6] although they have not been proven to work better than safer, regulated nicotine replacement products.[10][19] Their value in tobacco harm reduction is unclear, [19] with tentative evidence that they could help lower tobacco-related death and disease.[20] No serious adverse effects have been reported in trials.[6] Less serious adverse effects include throat and mouth irritation, vomiting, nausea, and coughing.[21]Non-smokers who use nicotine-containing e-liquids risk addiction to nicotine.[22][23][7]
E-cigarettes create an aerosol, commonly called vapor, [21][24] generally containing nicotine, flavors, glycerol and propylene glycol.[25] Its composition varies across and within manufacturers, and depends on the contents of the liquid, the electrical power of the device, and user behavior, among other factors.[24] The vapor can contain toxicants and traces of heavy metals at levels permissible in inhalation medicines, [25] and some potentially harmful chemicals not found in tobacco smoke at concentrations permissible by workplace safety standards.[26] However, chemical concentrations may exceed the stricter public safety limits.[21]
The modern e-cigarette was invented in 2003 by Chinese pharmacist Hon Lik, [27] and as of 2015 most e-cigarettes are made in China.[28] Since they were first sold in 2004 their global use has risen exponentially.[29] In the UK users have increased from 700, 000 in 2012 to 2.6 million in 2015.[30] In the United States e-cigarettes are used by a significant portion of young people.[31] and adults.[32]Reasons for using e-cigarettes involve trying to quit smoking, reduce risk, or save money, though many use them recreationally.[14] A majority of users still smoke tobacco, causing concerns that dual use may delay or deter quitting.[21] About 60% of UK users are smokers and roughly 40% are ex-smokers, while use among never-smokers is negligible.[30] Because of overlap with tobacco laws and medical drug policies, e-cigarette legislation is debated in many countries.[33] A European directive in 2016, set limits for liquids and vaporizers, ingredients, and child-proof liquid containers.[34] As of August 2016, the US FDA extended its regulatory power to include e-cigarettes.[35] As of 2014, there were 466 brands of e-cigarettes with global sales . thank you
