I do not think it is smart at all to be considering mixing the two. The effect is had on your mental health which is obviously already bad enough for you to be on medication should be enough to say no without bringing into account any life threatening side effects
Yes it is dangerous and not advised.
i am not going to be a smoker i just want to try it once, so would there be any life threating side effects when they mix?
Yes it would interact with any psychiatric medication and make them unable to help or at least be less effective so its generally not a good idea.