What are the physical health risks of using cannabis?

The most common physical health effect of long-term cannabis use is an increased risk of respiratory diseases associated with smoking (including cancer). This risk has been shown to be present even in the absence of tobacco smoke, while harms appear to be additive for individuals who smoke both tobacco and cannabis. Cannabis use is also associated with a range of mental health problems that may also increase risk to physical health.

Also see FAQ: What are the health risks of cannabis use?