A1. These two terms are interchangeable. Cannabis is used to refer to marijuana and vice versa.
Marijuana is a naturally occurring plant which is found in many parts of the world which includes the UK.
This plant is comprised of 3 subspecies which includes cannabis sativa, cannabis indica and cannabis ruderalis.
It is a dark green plant with distinctive spiky leaves and a pungent aroma. It contains the main chemical called 'tetrahydrocannabinol' which is directly responsible for the effects on the brain.
For more information visit what is marijuana section.