[SFW] Do you believe there are human pheromones?

What makes you think there are, or are not any pheromones influencing human behavior. How do the smells of other people influence your reaction to them? Is your sense of smell sensitive enough that you notice subtle day-to-day changes in those who are close to you? If so, how does your response vary as their scent changes? When, and where on the body, do you prefer natural human scents and when do chemical factories provide a better smell? If your answer is NSFW, respond here.