So I want to know...
Do you experience things like this? (claircognizance, clairvoyance, or any other clair--not the same to me as interpretation of dreams or tarot symbolism)
yep. I have claircognizance, clairvoyance, clairgustance, clairaudient clairsentience, andclairalient abilities and prob. more. I think I've pretty much covered them all here.
How often do you have these experiences?
very frequently. Practically every day. however, you get use to it and sometimes ignore it or take it for granted.
Can you control them or do they come and go?
sometimes, yes, I can control them, but sometimes not. and, yes, they do come and go--or at least I think they do. I did feel like i went through a long period where I did have them--but I was at the time under a tremendous amount of stress and was also ill. So, it may be that I wasn't paying attention to them if they did come. When you've experienced them all the time for much or all of your life--its easy to also take them for granted.
What percentage of the population do you think experience these things on a consistent basis?
Is it possible to hone this ability and if so, how did you do it?
I think everyone has these abilities--but probably hide them or haven't developed them or don't even realize they have them.
I especially have a very strong bond with my daughter and I did have one with one sister of mine. I would often *see* what was happening to them, and I could even feel what they were experiecing--joy, surprise, hurtful emotions, ill, fear, -- all these emotions. I'd even know EXACTLY. It was like I traveled to them at that time--and I'd see it playing out in front of me in my head--though I live several hundred miles apart from them both. All of us are in different states of the U.S.
It always freaked them out when I would call them then to check on them and tell them what I experienced and it would be word for word exactly what did happen.
now, I do astral travel and have experienced many remote viewings for them--not trying and sometimes trying too. Can't explain why it would happen, but it did. Mostly for them and myself--but also for other members of my family, for friends and it happens for people I've never met before but will after my experience. Sometimes these people come to me for a reading - but I've *seen* something occurring in their life days before they came to me or even THOUGHT to come for a reading. Not sure why that happens--or how. I just go with it and share it with them if they come in for a reading. Generally blows their minds.

(and mine too, tbh!).
I figure there is a reason for me to be able to do this and if I can share it with the people whom I get information about/for--I will do so. I love it when it happens and I can make the person its for happy to hear about it. Though, some people get fearful of it and me telling them, so if I know it'll be scary to them, I won't tell them. Sometimes its very odd--common everyday things. For one woman I met the first time through another friend that we shared, as soon as I shook her hand, I asked her, "is your husband and son shopping at the store and picking up taco things for your dinner tonight?" I could see them shpping and picking up this stuff. She was quite shocked and said, "yes! how did you know?" however, she did know I was a psychic--so she KNEW how I knew. I'm just not sure why that particular thing came to me. It just does.
I'm also an empath and I am able to pick up vibes about them when they are ill or something too. I just seem to *know*. I can pick this up also when I am beside someone I don't even know. That isn't always fun, but I'm getting better at controlling that.
It makes for some fun conversations though when it happens. Generally for my customers, it blows them away. Especially the clairgustant abilities and clairalient abilities. those two are a LOT of fun.

I mostly get the clairalient abilities for past over loved ones though. My dad, I smell either his after shave and cologne that he always wore or mostly his cigarettes he smoked. My Uncle, I smell his pipe. My mil, her perfume, that sort of thing. I get this also for my customers sometimes. I can't generally make that happen, but I'm happy when it does and I can share it with my customers. They generally like it too.
oooh, nearly forgot to say, I love this thread & reading of others who have this experience too! fun!
also forgot to answer your last 2 questions, but its late and I am finally tired enough to go to sleep. So, I'll be back to try and answer them tomorrow some time.