I'm so bad about getting rid of mine when I do occasionally relapse, even though I've more or less stopped. But honestly, sometimes I give it to a friend that knows I'm trying to stop, and they toss it. That way, things either have to get awkward (read: my precious!) or I have to shell out another five bucks for a smoke. Or, when you do give in and buy a pack, buy the nastiest ass brand. That's my rule, if I give in, I'm not gonna enjoy it more than nicotine gum and a 5 minute break. Keep a pack around, dehumidify it somehow, stick it in the freezer for a few days, pull it out: save those nasty stale death sticks, and see if you give in. But I have strange methods...lol.
There's also e-cigarettes: still not healthy and still very much so addictive since it is nicotine vapor, but no tar or carcinogens.