I have hypothyroidism but my doc said I may have hyperthyroidism as well. Could smoking marijuana have caused this or affect my thyroid at all?

Unlikely . Though certain thyroid conditions can cause both hypo and hyper thyroidism at one point or another, both cannot exist at the same time. It would be like saying your gas tank is full and empty at the same time. At this time there aren't any conclusive studies showing that chronic marijuana use directly affects thyroid function. However, marijuana does affect other hormones.