My intuition picks it up quite quickly. My antennae goes up and I am either attracted or repelled by the person. Usually there's no middle ground.
People either make me feel more comfortable or use tactics intended to pressure me. Usually I'm not affected by negative influences but some people are skillful, or they are so far on the other end of the spectrum that I find it difficult to even hold a conversation with them.
As you go about your day think about how you're influencing others. Do you make connections with people or are you out to make a quick buck? Do you respect others' time and let them know quickly when you aren't a match, or are you intentionally misleading, stringing people along to try to part them from their money?
What's your take on influencing?