Following forbidden things - a type of idolatry
أَرَأَيْتَ مَنِ اتَّخَذَ إِلَـٰهَهُ هَوَاهُ (Tell me about the one who has taken his desire as his god - 25:43). The one who practises forbidden things which are against the tenets of Islam to satisfy his personal desires is described in this verse as the worshiper of his own lust. Sayyidna Ibn ` Abbas ؓ said that the selfish desires are like an idol which is worshipped (by the infidels) and then he recited this verse to prove his point. (Qurtubi)