Lynsi

Awesome! I'll give it a try once the holiday weekend is past and will share my results! Thanks for the advice. I'm excited. 

In regards to fog, do you have a similar suggestion? 

I asked for "breath, fog, or smoke." I was thinking breath for the original photo I had shared, but was interested in learning the technique for all three scenarios (assuming that they all used a similar approach). 

Ok, here's a breath shot: https://500px.com/photo/94343515/breath-by-elena-shumilova?ctx_page=2&from=user&user_id=1171535

This one, however, is pretty sweet: https://500px.com/photo/136142557/the-young-potions-master-by-adrian-c-murray?ctx_page=1&from=user&user_id=2977031

Ok, I'm done. You get the point. Thanks. =)

Oh and here's one more from Adrian. This one is definitely "shopped" in.. because the haloing around the foot is killing me. But, despite that, the rest is what I'm after: https://500px.com/photo/139373447/discovering-toes-by-adrian-c-murray?ctx_page=1&from=user&user_id=2977031

Sure! Here's a few examples: 

In this photo, I highly doubt that the cat would stir up this much dust with it's feet. So, I'm assuming it's dust created in post. (She does a lot of similar dust/fog/smoke.) https://500px.com/photo/72652233/dust-on-the-way-by-elena-shumilova?ctx_page=2&from=user&user_id=1171535

Another by Elaina (unless Russia is just incredibly polluted, lol. j/k) https://500px.com/photo/29546491/last-winter-walk-by-elena-shumilova?ctx_page=4&from=user&user_id=1171535

And, here's one by Adrian. He has a lot of infiltrating light indoors. I'm assuming using a similar technique? https://500px.com/photo/139904245/speaking-between-the-lines-by-adrian-c-murray?ctx_page=1&from=user&user_id=2977031

Hi guys. I took this photo of my son on a very chilly evening. After doing my edit to it, I'm pretty happy. I just think that seeing his warm breath in the frigid air would add something special to it. Every time I try to add it, it looks really fake! I've tried different tools and opacities, but still can't get what I want. 
*I'd also like to know how to achieve a realistic smoke or fog to an image.. not this one, but others. =) Thanks!