Answer:
(Fatwa: 839/B=145/TB=1433)
First you should do true taubah repenting this bad habit of yours and make firm intention that you would not do such practice in future. The ruling is that kaffarah is not wajib on you. Only the qaza of those fasts is wajib during which you have done this practice. Days are shorter during winter; one does not feel hunger and thirst during day, so you should keep them now and then. This qaza shall be sufficient.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
