Tricia Lemon Putnam says:

Many illegal drugs or controlled substances are grown naturally. The Coca plant grows naturally and is quite lovely, as well as the opium poppy and psilocybin mushrooms. Although not illegal, tobacco is a plant but this does not make it safe for our children – which is what this story is about. Btw, all of the “naturally grown” plants above, including marijuana, were contributing factors in the death of my brother. I miss him every single day.