Assuming, for the purpose of this question, the effectiveness of regressive hypnosis, do you think it could lead to suicide (explanation if you click)?

Hypnosis works on the principle that the one under hypnosis is in a suggestive agreeable state of mind, And during hypnosis, the subconscious mind is still alert to any danger so any suggestions that would be detrimental to the safety of the one who has been hypnotized would be ignored or refused.

@kritiper: And also if they deepen the trance?

It makes no difference. The subconscious is always there, ever alert.

Look up de facto and de jure.

I don’t know enough to even guess.