the man above me has some good advice. If you are worried about smell, definitely crack the windows and get a nice air flow (unless doing tricks, my favorite )

One of the things i do is when im just with some buddies, i will take off my shirt, and smoke shirtless, which keeps my shirt smelling fresh.

To keep the eyes clear, i suggest buying a bottle of Visine LR ( Long Lasting Redness Relief, yellow label) Put one drop in both eyes RIGHT before you smoke, then if you still need some, put in some more drops afterwards.

like the amazing kane said, i smoke weed every day, and i still hack as shit when i take huge rips. Coughing is natural, just let it out, then grab some water.

Another tip: If you are going to drink cold water to soothe your throat, why not grab an orange soda, or something delicious instead of water.