I have also heard that our body stops producing stuff that we normally take which is for instance serotonin.
Same shit happens if you take opiates for a long time, and start using testosterone. After a while, your body will need that shot to produce it accordingly.
Endorphin is what worries me. I took opiates for a long time and up to this date I don´t feel as happy or satisfied as I should.
Same people say you must do sports like crazy develop a routine but I don´t have the time to go to gym and stay there as often as I wish, so I feel that sometimes I´m feeling good but most times I´m concerned and yes a little unhappy.