I have type 1 diabetes too. ALWAYS check blood sugar levels regularily before/during smoking.

Trust me, weed + hypos / low blood sugar = not good. The last time that happened, I was tripping but not in a good way. I didn't know who I was or what I was doing. Thats how bad it was. Just keep an eye on blood sugar levels, keep some sugary foods with you and you should be fine.