Let's get right down to the nitty-gritty here. When smoking alone, its all on you to make your smoke experience. With others, there are some rules to follow to keep your buddies wanting to keep smoking with you.
Do Not Toast The Bowl
I made this one #1 because this is the one that bugs me the most. I want to have the nice greeny flavor to at least a couple hits out of the bowl. Don't roast the entire side of the bowl in one hit!
Leave The Keif
Wait for special moments to have a kief bowl. Especially wait for your partner when you do. Times in need of a kief bowl are mainly when you've smoked at least three bowls, and don't feel much. The kief will send you on your way to happiness with a couple of rips.
Smoke Out The Ones Who Smoke You Out
If you are in a smoke circle and you have a sack on you, make sure to get your buddies back when they smoke you out. Don't just wait for them to load another bowl for you to smoke for free.
Soggy Lippin
When smoking with another person its best not to stick the entire pipe, bong, or joint around the inside of your lips. This person wants to get fried with you, not make out with you through the piece. Use the outer parts of your lips to smoke off of it. No one wants to burn off of a soggy joint.