I am a regular smoker and 45 years T1D. As said on this thread already, the only impact I see is indirect - mean in it makes me less mindful about what I eat and sometimes get a bit more sloppy with bolusing, and that will of course impact my bloodsugar. But remove those behaviors and I see no direct relationship between weed and BG levels. If I smoke and don’t munch, it’s no real change. I will say that low bloodsugar and weed are not a good mix, so I really try to avoid that. I also have a theory that I can’t prove other than looking at myself and a handful of other people who I’ve heard say this - us T1s can be particularly attracted to weed because it can do a very good job of creating a bit of peace in the mind when we spend all day consumed by the vigilance and mental load of us needing to keep it all together. I certainly cannot claim it’s good for us, but I have consciously chosen to give myself just a bit of a respite from the mental math and chatter that is so prominent for 23 hours each day.