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I have been hearing this from different online blogs and many people but think it's a conspiracy theory but would like to hear from more people who could have an idea about it, does cannabis weed heal and make the body healthy, Thank you

From WHO (World Health Organization):
Acute health effects of cannabis use
The acute effects of cannabis use has been recognized for many years, and recent studies have confirmed and extended earlier findings. These may be summarized as follows:

-Cannabis impairs cognitive development (capabilities of learning), including associative processes; free recall of previously learned items is often --
  impaired when cannabi is used both during learning and recall periods;
-Cannabis impairs psychomotor performance in a wide variety of tasks, such as motor coordination, divided attention, and operative tasks of many
  types; human performance on complex machinery can be impaired for as long as 24 hours after smoking as little as 20 mg of THC in cannabis; there is
  an increased risk of motor vehicle accidents among persons who drive when intoxicated by cannabis.

Chronic health effects of cannabis use
-Selective impairment of cognitive functioning which include the organization and integration of complex information involving various mechanisms of
  attention and memory processes;
-Prolonged use may lead to greater impairment, which may not recover with cessation of use, and which could affect daily life functions;
-Development of a cannabis dependence syndrome characterized by a loss of control over cannabis use is likely in chronic users;
-Cannabis use can exacerbate schizophrenia in affected individuals;
-Epithetial injury of the trachea and major bronchi is caused by long-term cannabis smoking;
-Airway injury, lung inflammation, and impaired pulmonary defence against infection from persistent cannabis consumption over prolonged periods;
-Heavy cannabis consumption is associated with a higher prevalence of symptoms of chronic bronchitis and a higher incidence of acute bronchitis than in
  the non-smoking cohort;
-Cannabis used during pregnancy is associated with impairment in fetal development leading to a reduction in birth weight;
-Cannabis use during pregnancy may lead to postnatal risk of rare forms of cancer although more research is needed in this area.

Full article : http://www.who.int/substance_abuse/facts/cannabis/en/

Look at the source of information of those who makes such claims. If they're pot heads, then the source is no good.