The dangers of illegal drugs are well known and rarely disputed, but how harmful are alcohol and tobacco by comparison? What are we missing by banning medical research into magic mushrooms, LSD and cannabis? Can they be sources of valuable treatments? The second edition of Drugs without the hot air looks at the science to allow anyone to make rational decisions based on objective evidence, asking: *What is addiction? Is there an addictive personality? *What is the role of cannabis in treating epilepsy? *How harmful is vaping? *How can psychedelics treat depression? *Where is the opioid crisis taking us?