Compared with many pharmaceuticals and illegal narcotics, cannabis has an extremely good safety profile. There has not been a single death attributed to the direct effects of cannabis ingestion.
Unlike opioids cannabis does not act on the central nervous system, which regulates breathing. Cannabis is not without risk, however.
For example, it does interact with some medications, and can cause an elevated heart rate. It is important to have medical supervision when using cannabis to treat a health condition.
Ask your employer about their policies before beginning treatment.
Last but not least, DON'T DRIVE HIGH.