Hi Amy,
Here are your answers:
It is very easy to become addicted to pheromones. Not because of what it does to you but because of how they affect others. Pheromone use can go from being a tool to a social crutch. Some members will not go outside unless they have some pheromones on.
The pheromones that you mentioned are a good start. There is probably no pheromone as inoffensive as Instant Shine. No one seems to react badly to Instant Shine. As far as dosage, use this post to find your “sweet spot”: