I’ve been wondering this for a while now. Let’s say you’ve never smoked weed before but you try it in a lucid dream. Will you even get high? If you do, would you even feel it? How can you feel it if you’ve never gotten high before?
Also, I’ve seen threads about people wanting to ask other people questions while lucid, like asking a dead president questions. Will the answers they give even be true?
The SC is VERY powerful and create experiences you’ve never had before beyond anything you can imagine 
If that created experience is the same as the waking life one is another story…
It can be different all the time. If you never smoked weed, you wont have exactly the experience weed gives. But your SC will make up a nice experience anyway. I’ve done alcohol IRL, but in dreams i just get a weird blackout from alcohol, tried it 3 times. As mattias said, you will get experiences in dreams you cant imagine IRL 