after chemotherapy he met belachew girma and learned how to laugh again. classical medical practitioners may smile about belachew's methods. but his patient says the treatment has helped him. >> since i've been coming here, i've felt better. i can talk to people again and even work. i don't need painkillers anymore. laughter is like medicine to me. i've left my cancer behind. >> the laughter therapist has hard times behind him as well. ten years ago, after his wife died, belachew became addicted to drugs and alcohol. he's now married again and his two children seem to be as upbeat as he is. it took a lot of effort for belachew to learn how to laugh. during his addiction, he came upon a book that praised the healing effects of laughter. after that, he treated himself. >> laughter is the best cleaner. it can clean or delete the old files. the way, the two keys for laughing, is, the first is forgetting negative memory or negative emotion. that means deleting all the files. when you delete it, laughter helps you to delete. that means you never focus on back his