What have they been smoking?

http://www.bangkokpost.com/news/local/11447/farm-lobby-threatens-to-sue-over-herb-list

In short, 13 herbs and plants labelled as hazardous substance type 1 by the Industry Ministry are neem, lemongrass, turmeric, ginger, Chinese ginger, African marigold, Siam weed or bitter bush, tea seed cake, chilli, Chinese celery, ringworn bush, glory lily and stemona.

I read about it over the weekend. My only comment was what have they been smoking? Duh!