hi welcome to HCM,
Cannabis has psychoactive and physiological effects when consumed. The minimum amount of THC required to have a perceptible psychoactive effect is about 10 micrograms per kilogram of body weight Aside from a subjective change in perception and, most notably, mood, the most common short-term physical and neurological effects include increased heart rate, lowered blood pressure, impairment of short-term and working memory,psychomotor coordination, and concentration. Long-term effects are less clear.
Deaths associated to cannabis overdose are exceptionally rare. Fatalities resulting from cannabis overdose are said to most often occur after intravenous injection of hashish oil.
possibility of cannabis dependence; the potential of cannabis as a "gateway drug"; its effects on intelligence and memory; its effect on the lungs; and the relationship, if any, of cannabis use to mental disorders such as schizophrenia, psychosis, Depersonalization disorderand depression.
Thus ,you must refer a psychiatric center for de-addiction process.
hope ,i answered your query.
regards

Smoking either cigarettes or marijuana will affect healing anyway because of the carcinogens in it, carbon-monoxide, carbon particles, etc. The marijuana will give you a high but will not cure the pain. You need to stop taking recourse in smoking for treating your health-problem. Its an addiction, hope you realise that. Also, besides the increased risks of lung cancer, stroke, heart attacks, Alzheimer's, Chronic lung disease, smoking also makes your bones osteoporotic--takes calcium away from the bones, which'll further weaken your spine and worsen your pain. Take up a healthy daily activity such as swimming or cycling to strengthen your back instead.