I'd consider yourself lucky to have a friend who is interested in trying and sharing the experience with you. Not sure who said it, but it's true: a true friend knows all the bad things about you, and remains.
While I keep my smoking somewhat closeted, I have a few friends who know and when I smoke with them, I find it safe harbor. I don't have to worry about what they think or whether they'll say it to the world. If keeping yourself closeted is important to you, but you have a friend who wants to smoke with you, that can be a great thing.
As for encouraging your friend to smoke, I don't think you need to put forth much effort. If he wants to learn to inhale, he will. Very few people try to inhale over and over again, yet never "get it". Eventually, lungs get used to smoking, unless there's some sort of allergy. Even asthmatics sometimes find smoking to relieve some of their worst symptoms. It's his choice whether or not to smoke, regardless of his reaction to it. No need to feel any guilt about his choices, or yours, for that matter.
Pretending not to enjoy it for the sake of your friend that has difficulty? I think that's silly, too. Once your friend knows you enjoy smoking and that you have the ability to inhale properly, he might even be a bit jealous. Again, it's his choice to continue or not.
If you can't be yourself around your friend, who can you be, ever?
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