Whether scandal is a mortal sin?

Objections

Objection 1 : It would seem that scandal is a mortal sin. For every sin that is contrary to charity is a mortal sin, as stated above (Question [24], Article [12]; Question [35], Article [3]). But scandal is contrary to charity, as stated above (Articles [2],3). Therefore scandal is a mortal sin.
Objection 2 : Further, no sin, save mortal sin, deserves the punishment of eternal damnation. But scandal deserves the punishment of eternal damnation, according to Mt. 18:6: "He that shall scandalize one of these little ones, that believe in Me, it were better for him that a mill-stone should be hanged about his neck, and that he should be drowned in the depth of the sea." For, as Jerome says on this passage, "it is much better to receive a brief punishment for a fault, than to await everlasting torments." Therefore scandal is a mortal sin.
Objection 3 : Further, every sin committed against God is a mortal sin, because mortal sin alone turns man away from God. Now scandal is a sin against God, for the Apostle says (1 Cor. 8:12): "When you wound the weak conscience of the brethren [*Vulg.: 'When you sin thus against the brethren and wound their weak conscience'], you sin against Christ." Therefore scandal is always a mortal sin.