Rule 1: Never buy anything advertised in spam.
Spam is all about selling: spammers only need one or two people to buy something for every million spams they send - this junk only exists because there are people who buy what the spammers peddle. If nobody bought the "product", then there wouldn't be any point to sending spam.
Rule 2: Never reply to spam.
Replying to spam merely shows that your address is valid and that you read your mail - in other words, that you're just the type of target the spammer is looking for. The only guaranteed outcome of your reply is that the spammers will send you even more spam.
Rule 3: Never use "remove" options in a spam.
Using the "remove" option in a spam is like replying, but is even worse because it shows that you have actually read it thoroughly - the "Holy Grail" of spam. Using a remove option highlights you as a perfect spam target and will turn the relatively gentle shower of spam you're currently getting into a deluge of truly biblical proportions.
Rule 4: Distrust everything.
Simple common sense should tell you that if something looks too good to be true, then it probably is. Don't be gullible: if you receive mail that offers you something and you don't personally know the sender, then you should assume the worst about it. Applying a little basic skepticism to everything you receive isn't paranoia - it's a healthy survival instinct.