I think your teacher was just supposed to pass on the message to you, but like others have said it is up to you what happens. Just because you got an attunement, you are not going to automatically stop your bad habits. If it's time for you to do so according to your higher self, then you might slowly lose your appetite for it. It could also happen months or years later after an attunement. That did happen to me. I wouldn't call it a habit or addiction, but I did like to bake pastries and eat them (most of my family doesn't eat pastries so I had to). My first reiki class was in 2014. Around 2016 is when I had the realization that I was consuming too much sugar through my baked goods and I pretty much haven't baked except for one or two occasions during the year.
On the other hand, starting on the reiki path could change your life in other ways, too, so keep an eye out for that.
