The authors studied the physical and chemical features of second generation cannabis grown in the United Kingdom and from seeds imported from known geographical areas. In general, the physical appearance of the second generation plants resembled their parents as those produced from the second generation plants were not usually distinguishable from the first generation plants. There were some exceptions to the similarities in the cannabinoid patterns. The second generation cannabis plants produced significantly higher yields, but the tetrahydrocannabinol (THC) contents were lower. In addition, the tetrocannabinolic acid (THCA) to THC ratios were much lower in the second generation plants, but higher in the fresh imported cannabis. 2 tables, 16 references. (Author abstract modified)