I think they are amazing. I used to smoke 22 cigarettes a day. Yesterday I only needed 4 lozenge's to get through the day without a headache or any withdrawal symptoms at all. I am using the mint flavored. Today I have used about 6, and have an extremely mild headache. I wouldn't even call it a headache, just a constant feeling of tiredness. Then again I woke up at 8 and its 10 maybe its just time for bed. I am diffidently a fan!