Using cannabis while pregnant may harm the unborn baby. Cannabis smoke contains many of the same harmful chemicals found in cigarette smoke.
The risk of developing a psychotic illness is higher in people who:
Another cannabinoid drug, called Nabilone, is sometimes used to relieve sickness in people having chemotherapy for cancer.
Other risks of cannabis
Read the latest updates on cannabis, cannabinoids and cancer – the evidence so far on the Cancer Research UK website.
If regular users stop taking cannabis, they may get withdrawal symptoms, such as feeling moody and irritable, feeling sick, difficulty sleeping, difficulty eating, sweating, shaking and diarrhoea.
Other risks of regularly using cannabis can include:
Cannabis has not been linked to birth defects, but research suggests that using cannabis regularly during pregnancy could affect a baby's brain development as they get older.
Jon Chase/Harvard Staff Photographer
GAZETTE: Are the characteristics of cannabis addiction common to other types of addiction?
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HILL: How are things misrepresented by anti-cannabis crusaders? They tend to ignore the idea that dose matters. When we talk about the harms of cannabis, young people using regularly can have cognitive problems, up to an eight-point loss of IQ over time. It can worsen depression. It can worsen anxiety. But all of those consequences depend upon the dose. The data that shows those impacts look at young people who are using pretty much every day. They’re heavy users who usually meet criteria for cannabis-use disorder. So when people who are opposed to cannabis talk about those harms, they don’t mention that they’re talking about heavy users. The 16-year-old kid who uses once or twice a week, I’d still be worried about it, but that use has not been correlated to these harms.
GAZETTE: What is cannabis addiction like?
GAZETTE: Is pain one area that cannabis is proven for?