According to scientists, the only harm caused by smoking marijuana is various illnesses of the gums.
Scientists from the USA and New Zealand concluded that the only serious risk from smoking marijuana is the progression of illnesses of the gums.
A report of this research is published in JAMA Psychiatry.
Staff from Duke University in Durham and the University of Otago in Dunedin and their colleagues from other universities analyzed the data of 1037 New Zealanders who were born in Dunedin in 1972 and 1973. They were aged under 38 and had taken part in the population research Dunedin Multidisciplinary Health and Development Study.
The scientists were interested in the level of consumption of weed and tobacco by the volunteers, and, moreover, their health, including overall health, the existence of diseases of the oral cavity and respiratory path, signs of system inflammation and metabolism (waist circumference, body mass index, arterial pressure, levels of high-density lipoproteins, triglycerides and glucose in the blood). Their health was analyzed at the ages of 26 and 38.
Monitoring was carried out from the ages of 18 to 38. The level of consumption of marijuana and tobacco was measured at the ages of 18, 21, 26, 32, and 38. Altogether, 484 volunteers were smoking tobacco every day at some point in the period, and 675 volunteers had smoked marijuana.
After adjusting for smoking tobacco, alcohol abuse, frequency of cleaning teeth, initial health and lifestyle, the scientists found that the frequency of smoking marijuana correlates with the state of the gums. The health of the gums of marijuana smokers at 38 was worse than the health of the gums of the other volunteers and worse than the health of the gums at 26.
The scientists did not register any other deviations in their physical conditions that correlated with smoking marijuana. At the same time, smoking tobacco correlated with poor levels of all aspects of health.