That depends on what you are talking about. If you mean can you use cannabis for recreational purposes, then the answer is a definite NO. If you mean can it be used medicinally, then the answer is YES, but with conditions.
If you have tried conventional medicines for a reasonable time, and found them ineffective or intolerable, you may get approval to use medicinal cannabis 1.
Some specialists can already prescribe certain drugs for use, but other than that your doctor will need to gain approval. This is done by showing scientific evidence that medicinal cannabis is proven effective for your condition.
At the moment, good scientific evidence is limited, but there are more and more research projects being performed
If you think you will be approved to smoke marijuana, think again. That will not happen due to the significant risks associated with smoking. These risks are similar to those involved in tobacco smoking.