Of course, you can't control other people, Laurel. Not even a little; not a smidge. Every man and woman is their own sailing vessel powered by their own thoughts, emotions, and imagination. You can't improve their smile, nor even add to their woes, unless, at some level, they let you.
So, does that pretty much clear up the effect others can have on you?
You rule,
The Universe
Just don't let them know you're ticklish, Laurel.