How addictive is heroin?

Methadone is very strong I took it for six months trying to kick Oxycontin's and ended up hook on it. The withdraw is a lot more intense and last longer it totally drains your energy and it builds up in your bones witch takes longer to leave your this is not the way I would recommend anyone to try to detox it is just a way for the government to make money off drug addicts. They should stop making this stuff