They work well I use them at bedtime to help me unwind and get to sleep it helps relax me and even helps a little bit with aches and pains. It really depends on how many times you draw how long you draw for when you're inhaling obviously the more you use the better of the effect.
I like to take one after my breakfast has settled, and it starts creeping up over the next few hours. The effect is never too much that it impacts my dexterity and I have never felt negative effects from daily use. The taste is so good, I'm tempted to have another, but I know better. It will never replace the flower, but it makes a great compliment.