The last time I was doing a lot of kriya, I woke up one morning and said I was done eating meat and stopped for 2 years. Quitting meat was something I had been dabbling with for a bit but it seems the energy from kriya gave me the strength to make the best decision for myself.
There is a lot of power that can be woken up from within this practice. It helps you come from a place of totally believing in yourself. So good on you for staying strong. And even with going back to old habits, there is always time to get back on track.