by amendment made in colonial law by 1980s and through the Ayurveda Act.
article: Cannabis in Sri Lanka The sale of cannabis is decriminalized for traditional medicine vendors and it is commonly used in Ayurvedic traditional medicines.
You maybe already asked yourself "Is Cannabis in Sri Lanka legal?" In Sri Lanka Cannabis (or Marijuana) is decriminalized for recreational and legal for medical use. About 1.5% of the people in Sri Lanka used Cannabis within the last year.