First, I would say, the whole coughing issue is due to shortness of breath, if your sitting there taking toke, aftet toke out of a bong, Im sure your not getting a whole bunch of fresh oxygen into your lungs, which would probably cause you to feel a bit light headed , but I do not thing it increases the high,
Some people cough on tiny hits, some people can rip a 3-4ft bong and not cough once, Does it mean the person taking tiny hits coughing is getting higher? no.
(All In my Opinion, ofcourse)
As for the whole indica / sativa , it depends on the person, if you want to get couch locked and sit and eat while watching tv your probably going to want to smoke indicas, if your going to be going out running errands and doing shit all day, and still want to be able to function, and be high, Sativa is probably what you'd want.
As for the ammount of trichomes, well, As long as the bud hasn't been sprayed, I would tend to think that yes, the more trichomes on the bud, the more content of thc is would have, there for you would get higher, but also, is the bud sticky? is it dry? does it have a potent smell? All makes a difference to me (and this again, is all my opinion)
I think alot of people go through the whole 'laced' weed phase when they first start smoking, I haven't heard too many experienced weed smokers say "Oh I got laced weed and I was hallucinating"
I remember when I was younger, I got my first bag of the best weed Ive ever had (still to this day), and it FUCKED me up, I had Closed eye visuals, and music sounded incredible, but, other than CEVs, I haven't really ever hallucinated from weed other than seeing things in the corner of my eye, that could be paranoia, or it could've been the combination of medications I take
I can throw seeds on the ground, but they wont grow unless I put them under dirt or soil for some odd reasom

lol,
Im actually pretty good with plant, Ive been growing marijuana recently and I've found it VERY easy to get passed vegging stage, flowering is where I start to have problems. Could've easily been my fault with the nutes or pH, but Im
only my second real grow, so, we shall see.
I always seem to get into politics, or religion when it comes to stoned debates, not sure why.