The two THCs are chemically distinct in the placement in the double bond. The two cannabinoids have a series of carbon atoms, but delta-8 has the double bond to the eighth carbon, While delta-nine has it around the ninth. Delta-eight liquid also comes in disposable vaping products known as pens. https://johnathannbljn.blogthisbiz.com/39528710/delta-8-thc-an-overview