Assuming this is accurately dosed (Almost all street tabs are severely underdosed), 100ug should be a very fun dose that is still quite manageable provided you have a good mindset and setting. You will experience quite a bit of visual distortion. You'll start coming up after 40-90 minutes and the trip should last 8-12 hours between taking it and coming down. I am not familiar with kanna, but there should not be any cross-tolerance (though I would recommend abstaining from any substances for a minimum of 48 hours prior to taking the LSD until the day after your trip. Make sure to have an experienced trip-sitter present, get lots of sleep before and after, and do it somewhere where you won't be bothered (The best choice, if you are an adult, would be your home or your trip-sitter's home)
Enjoy, and have a good trip!