Neurologists will use different compounds of cannabis in capsule form.

BBC: Cannabis trials to start on patients

The craft is carrying a time capsule in the form of a golden gramophone record, complete with stylus, which contains a recording of greetings from Earth in different languages as well as samples of music ranging from Mozart to singer Blind Willie Johnson.

BBC: Voyager impression (Nasa)

It is available in herb shops in Europe and the United States, and comes in liquid, capsule and dried form.

CNN: Health half banner