Because yew is very toxic. Long-term consumption in large quantities will cause serious toxic and side effects to human body, such as inhibiting hematopoietic function of bone marrow and leukopenia. In order to ensure food safety, the Ministry of Health issued an announcement to remind consumers not to eat yew or foods containing yew, and to prohibit food production and business units from producing and selling foods containing yew. Therefore, the reason why the country prohibits the use of Taxus chopsticks is because Taxus is very toxic.