I guess it really depends on how much you trust your doc. I have had to ask my doc to give me a smaller prescription a few times - simply because I don't want the temptation. Have you discussed with the doc what might happen if you did feel that way? It might help. Mine usually just tells me to call him if I feel like jumping off a bridge or something. My usual response is: I don't like heights, so that'll never happen. There is an understanding there. That's all you need - you know there's help there if you need it.