What effects of phentermine and marijuana used together?

My wife was taking phentermine to lose weight and she is a chronic marijuana smoker. Smoking marijuana helped her to sleep easier at night, as the phentermine would keep her up. With the high doses of phentermine she was taking, the marijuana also helped her with eating the smallest portions of food. She really did not have much of an appetite which is good if you are wanting to lose weight, however, you still need to eat in order to get nutrition. Word of advise, drink plenty of water throughout the day while taking phentermine. My wife has since stopped taking the prescribe "crack" and has shown no signs of problems with the combination of both phentermine and marijuana. I hope this is helpful with your question.