Cannabis smoke contains thousands of organic and inorganic chemical compounds. This tar is chemically similar to that found in tobacco smoke,  and over fifty known carcinogens have been identified in cannabis smoke,  including; nitrosamines, reactive aldehydes, and polycylic hydrocarbons, including benz[a]pyrene.  Light and moderate use of cannabis is not believed to increase risk of lung or upper airway cancer. Evidence for causing these cancers is mixed concerning heavy, long-term use. In general there are far lower risks of pulmonary complications for regular cannabis smokers when compared with those of tobacco.  Combustion products are not present when using a vaporizer , consuming THC in pill form, or consuming cannabis edibles .
Personally I have just had two cataract operations and I used magnesium chloride eye drops that I made up myself using this pure magnesium oil diluted 15 parts distilled water to one part magnesium. The surgery was a success and my recovery was quick. This same magnesium can be put in a nebulizer and can be used at home by patients both before and after surgery both orally and transdermally to great effect. Surgeons need to become familiar with the transdermal approach for then they can start their patients off with heavy application weeks before surgery and for weeks after since this method of application can easily be done at home by patients. For use with a nebulizer again I recommend only the purest magnesium available. Even the pharmaceutical grades have heavy metal contamination so are not suitable.
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