So ... most importantly ... we need to distinguish between the actual theological term scandal and the more popular usage. True scandal is when you cause someone to commit a sin, vs. the popular notion that it's basically just being "shocked" by something. "Oh, I do declare ... I can't believe that ..." (while swooning).
So, if the action of ours is something that might normally cause an individual to commit a sin, then we're guilty of sin (grave sin if it's an inducement to grave sin and venial if an inducement to venial sin). If a woman, for instance, walked around naked in front of some men, that would normally (and reasonably) cause a proximate occasion of sin for them, and she' be guilty of the grave sin of scandal (barring other conditions for mortal sin), even if no one happened to consent to grave sin (because they fought the temptation).
Now, if some activity of yours were to cause someone to sin because the individual is somehow hypersensitive, such as if someone saw uncovered ankles, then this is known as "scandal of the weak", and the woman there would be committing no sin by having uncovered ankles. Now, if she knows that someone has this problem, charity would suggest avoiding the behavior, so not avoiding the behavior (with positive knowledge of how it's a near occasion of sin for that individual, who has some issues), could be a sin against charity.
Now, just causing people to be "shocked" or even "disedified" isn't really scandal. Let's say you have a priest who's going around belching all the time. There's a degree of scandal there because of the actual effect (other than emotional shock) of perhaps reducing the respect of reverence the people who witness this behavior might have for the priesthood. In the case of grave sins committed by priests, often people use that as an "excuse" to leave the Church and denounce Catholicism or Traditional Catholicism, but in 99% of all cases, those people were just looking for an excuse or a reason to leave, but have ulterior motives ... since it's quite obvious that all people are human beings and sinners, including priests, and the falls of individual priests does nothing to impugn the validity of the Church's doctrine and the marks of the Church any more than Judas' betrayal discredited Our Lord's divinity. So that would be something in between the belching priest and an actual sin of scandal.
But, short answer to your question ... if you engage in some activity or behavior (with the usual conditions for mortal sin ... e.g., knowingly, with full advertence, consent of the will, etc.) that should be known to reasonably constitute an occasion of sin, then you're guilty of sin, mortal or venial depending on whether the sin you elicited was mortal or venial (normally, for the normal person) ... whether or not the person actually gives in to your scandalous behavior. That could involve direct inducement to sin (e.g., impurity, either by one's dress or actions or even by force), or by counsel (suggesting someone to commit a mortal sin and using peer pressure to incite it), or by giving false information or counsel (e.g., "that's not a sin" ... if you know or should know the statement is false, even if it exonerates the person who then does it thinking it's not a sin), etc.