When you're exposing your skin to 4,000 toxins, the odd cucumber facepack isn't going to do much good.
Cucumber has some good things in it. Vitamins and what not. But put it up against lead, ammonia, arsenic and the 3,997 other nasties a fag exposes your skin to and it doesn't stand much a chance. Hey, it's only a cucumber. You seem to expect an awful lot from your vegetables. Quitline 0800 002200