Vaping and lung illnesses: What is behind this curious US phenomenon?

There has now been more than 450 cases of serious lung illnesses linked to vaping in the US. The American media, public health bodies and anti-tobacco NGOs have been out in force warning people of the supposed threat of e-cigarettes. However, it’s become increasingly apparent that THC oil – not commercially-available nicotine e-liquid – is the likely culprit. Some scientists…