Is the one who smokes in the mosque committing two sins, the sin of smoking and the sin of being in the mosque, or one sin, the sin of smoking?

The questioner : Shaykh, I saw a person smoking in a mosque.

The Shaykh: Allah is the Greatest!

The questioner : I pointed out to him that this is forbidden, then I said to him: You are also violating the sanctity of the mosque, so you have committed two sins. I said this in front of some noble brothers, and one of them said to me: You told him the sin became two sins, how is that possible? It did not become two. I said to him: ... because he violated the sanctity of the mosque, this is the House of Allah. So I did not understand his interpretation that this is only one sin. Is he correct, or am I?

The Shaykh : No, he is definitely wrong. He is wrong because, if we look at it, you agree with me that smoking is forbidden, right?

The questioner : Yes, yes.

The Shaykh : Okay, does committing a forbidden act in the mosque mean he sees nothing wrong with it?

The questioner : He did not see it as a greater sin.

The Shaykh : It is negligence, negligence.

The questioner: Yes.