Cannabis has become far more potent over the years, and that may explain why the number of people becoming addicted to the drug has soared, a new study suggests.
Researchers from the University of Bath Addiction and Mental Health Group in the United Kingdom used data from 20 studies to analyze the relationship between the types of marijuana people use and their addiction and mental health problems. The studies involved nearly 120,000 people in all.
The team has done past studies on the concentration of THC — the psychoactive component in cannabis — so knew that it has increased significantly over time, making today’s pot much stronger….