Rav Vosner gave a t'shuva to someone who was asking for a seder t'shuvas hamishkal for aveiros that had been done continuously for many years. Rav Vosner brings a Yismach Moshe who says that t'shuvas hamishkal is only neccesary for a one-time aveira. But for an addiction, it is enough the tremendous effort and accomplishment of getting over the addiction!
The Yismach Moshe said that this was revealed to him in a dream. Rav Vosner says that although we don't pasken based on dreams, this we do pasken, because it is true!
(Cheilek 4, tshuva 55).