Pharmacy and healthcare staff should be aware and ask patients if they take any other medication when prescribing, selling or administering alternative medicines such as  Chinese wolfberry, chamomile tea, cannabis, cranberry, chitosan, green tea, Ginkgo biloba , ginger, spinach, St. John’s Wort, sushi and smoking tobacco. The concomitant use of the aforementioned therapies, teas, sushi and smoking has shown to increase the risk of bleeding taken with warfarin.