I ve tried many times to give up smoking, i.e. lung association course, patches, Nicorette gum, some pills which I can t remember the name, and Champix. Just for Champix alone, I spent over 1K. Now I want to try and stop again but being a senior, I cannot afford to pay for the Champix. I do have some left though but the expiry date is March 2014. Would it be effective/safe to take these now