One roll of Smarties is 25 calories. A glucose tab, if I remember correctly, is 15 calories. So, a in a hypothetical hypoglycemia in which your blood sugar is 50 mg/dl, if you would normally treat with 6 1/2 glucose tabs (=105 cal), you could substitute 4 rols of Smarties (100 cal.).
One problem is that if my blood sugar is low enough, or say it is the middle of the night, I can loose track of the number of tabs I’ve eaten. Particularly at night it is important not to overdo it in seeking relief, or you’ll wake in the morning feeling awful with hyperglycemia. To prevent this, I think I’ll try the smarties unwrapped, but place them in allotments of 100 calories in small containers (I’ve got a lot of the little baby food plastic containers which are perfectly sized), but you could use old glucose tubes (I don’t know if Kristin is using the small tubes or the larger containers for hers).