Hello, my brother is taking eltroxin since 15 years. Now he has the problems such as behaving abnormally(sometimes), thinking too much, being in his own mood, sweating, depressed etc..he also take cigrattes since 1 year. At the begging of that year he used to take cigrattes very few but since 6 month he is taking at least 2 a day.what may be the cause of his above problems? Can anyone please suggest me?