If.

ἐι translated as “if” in this case means if and it is true. There are two aspects of “if and it is true”. One: if and it is true that you have escaped and two: if and it is true that you are entangled.

If and it is true that you have escaped.
There are two aspects of the escape in view here.
One: the escape that comes from the penalty of sin. “Therefore there is now no condemnation for those who are in Christ Jesus." (Romans 8:1, NASB95)
The second escape that we have is from the power of sin. "Even so consider yourselves to be dead to sin, but alive to God in Christ Jesus." (Romans 6:11, NASB95)
Even though we are “dead to sin” we can choose to sin. That choice places us under sins control. "and do not go on presenting the members of your body to sin as instruments of unrighteousness; but present yourselves to God as those alive from the dead, and your members as instruments of righteousness to God." (Romans 6:13, NASB95)

If and it is true that you are entangled.
The idea behind entangled here is that of a weaving. It is not something that is catching on to you it is, however, something that is becoming interwoven with you. As you may know when you weave something together it becomes stronger and more difficult to brake. This is how it is with a Christian who becomes entangled with sin. And just as in weaving a pattern emerges.

This pattern is not random.
"But each one is tempted when he is carried away and enticed by his own lust." (James 1:14, NASB95)
First there is temptation and the decision to do the sin. Sometimes hours or days may go by where the sin is considered from every angle as Eve did in Genesis 3:6. At some point though you will bite, so to speak, and commit the sin. After the sin is committed comes guilt. As the pattern re-enforces itself the ability to choose not to sin is lost and eventually the guilt goes away, in its place is emptiness.