Consider shortening your Mortgage loan in years

I spend over $50.00 per week on smokes & deicided why not shorten the term of my home loan & make extra payments eack week, therefore the day before the BIG D DAY to give up smoking I had already arranged a extra $25.00 per week to be paid towards my mortgage & if after 6 months if I'm still a X smoker then I will arrange for another $25.00 towards my mortgage