Littlebit- i'll tell you something....i didnt realize how much my personality had changed when i was using these thermos...i had anxiety, depression, aggressive, was moody, irritatible and basically felt bad most of the time...i could even deal with stress of any measure...i did not know how bad i was, until i was clean...my life has totally changed...i would be afraid to use them again, i dont like the way they made me feel...but what was strange was, i didnt even know it.