If you've ever been in an addiction recovery program, you know that having an organized relapse prevention plan is part of staying clean–and part of an effective relapse prevention plan is knowing your personal "triggers" or weak points. One recovering alcoholic may be easily roped into "drinking away" her troubles; another may habitually reach for the bottle when bored; still another may be used to celebrating special occasions with a glass of wine. And these categories have subcategories: one person's greatest stressor is socializing at networking events; another may be invigorated by networking but turn into a bundle of nerves over bad news on CNN.
Even if you've never been tempted by any chemical stronger than coffee, everyone has areas of special vulnerability to sin that starts with "the lust of the flesh, the lust of the eyes, and the pride of life." While sometimes we get caught off guard and can only cry out to God for His "way of escape," it's just plain foolish to deliberately walk into a situation we know brings out the worst in us.
Fatigue or illness. Being worn down and under the weather brings out the worst in people. If you find yourself frequently getting irritable or making promises you can't keep, often the most spiritual thing you can do is take a few weeks' vacation without email. Or at least start saying "Sorry, I can't help with that" more often, and going to bed earlier and eating more vegetables and protein.
Ingrained habits. Returning to the addiction example, there are people who really can't take a sip of beer or log into a Facebook account without careening into a binge of the worst order; that first move may be a conscious decision, but their brains are literally programmed to take it and run with it, and the only way they can control themselves is to abstain from the activity altogether. Even people without diagnosable addictions have brain neurochannels programmed to respond in specific ways to specific situations: i. e., habits. There are two rules of breaking bad habits: find healthy habits to replace them, and think long and hard before going "just a little" way down the trail that consistently takes you into wrong behavior.
The good news is, God can use even our weaknesses for His purposes–which is one reason He doesn't always eliminate our weaknesses even when we're eager to be rid of them. Follow the example of St. Paul: give your weaknesses to God for His use, even as you trust Him to use your strengths.
Everything He creates–even the temptation-vulnerable areas of our personalities–He creates for a good reason.