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It's really a personal choice as to how far you go.
But clear cut things like the casual sex is a no-no. And Christians shouldn't do it.

It's pretty much an application of Christian faith. As to how far you go. There's no real clear cut line. Obvious things like drugs/casual sex are easy, but when it's things like smoking and alcohol, it's a bit harder.

It's really up to the individual Christian. Smoking is a widespread habit. It's not a good thing for the body. But peer pressure in early age and stress tends to develop the habit. And that feeds into a lot of the "addiction" sermons that talk about how addictions tend to refocus our attention and priorities and sometimes puts God in further down the list.

I think that Christians can go and get involved in the movement, they're people after all, but they just have to remember to get their priorities right and to do things responsibly. They're people but they're Christians, that means following Christ's way.

Well if you're going to take trash like this into this forum, you'll still be required to back it up.

Cult by what definition and evidence why?

Wow, you mean I actually qualify to be part of an edgy social movement? That's a first in my life. >.<
It seems to me that parading your good deeds (drawing an 'X' on your hand) is kind of a violation of the spirit of Matt 6:5, though:

That is entirely correct if we were talking about prayer. But what this movement is about, as it relates to Christians, can be traced to:
The X, which not all straight edgers use, is a symbol meaning that you choose not to do anything which is harmful to your body. People don't tend to offer you drugs, alcohol, cigarettes, etc. if the know what it means. The X does not "parade good deeds", it's just a symbol which stands for something you believe in. I don't think that it's any different than wearing a cross necklace or a WWJD? bracelet.

I would also like to applaud you for staying on topic and making a serious post.

And all other things related to your faith.

"Be careful not to do your 'acts of righteousness' before men, to be seen by them. If you do, you will have no reward from your Father in heaven.

You assume that cross necklaces or WWJD bracelets don't directly go against Jesus's words.

Not everyone would agree.

I was responding to the 'terms not mutually exclusive' comment, not to the discussion of Mormons. Many Christian believe that the Nicene Creed determines what faiths are or aren't Christian. Except, of course, those Christians who don't believe in the Nicene Creed. Wether Mormons are Christian or not is up to them to decide.