为什么中国人几千年来没有出现大批大麻毒品瘾君子呢？关键是此大麻非彼大麻。中国种植的大多是工业大麻，特别是汉麻。A field study was performed to investigate the development of cannabinoids in flowers of industrial hemp using three day-length-sensitive and two day-length-neutral varieties. Flower sa