In strict Jain principles, cheese is generally not considered suitable for a highly observant Jain, because it is a milk-based product and dairy is associated with hiṃsā in production. Many Jain traditions regard milk, curd, butter, ghee, and cheese as abhakshya or at least not fit for the strict vow of nonviolence, especially for those following a very careful and ascetic observance.

Why do some Jains still eat it?

• Different levels of observance exist in Jain society.
• Householders may follow a less strict diet than monks and nuns.
• In some families, due to custom, region, or practical compromise, dairy foods are consumed.
• But from a strict Jain ethical standpoint, avoiding cheese is more in harmony with ahimsa.

So the simple answer is:

• Strict Jain view: cheese should be avoided.
• Everyday practice in some Jain households: some still consume it, but this is a matter of less strict observance, not the ideal of the Jain vows.

If one wants to follow Jain ahimsa more carefully, then cheese should be left out.