The chemistry of cannabis

The Israel scientist Raphael Mechoulam has been researching what’s thought to be the world’s most popular drug since the 1960s. In 1964, he isolated Tetrahydrocannabinol, or THC – the compound that gets cannabis-users high. Later, professor Mechoulam discovered another compound called CBD, or Cannabidiol, which has medical benefits without any kind of psychoactive effect. Recently, CBD has had a revolutionary impact on treating health conditions such as epilepsy. Prof Mechoulam talks to Claire Bowes. (Photo: A marihuana plant in India. Credit: Getty Images)