In Jainism there is no explicit, canonical ban in the scriptures specifically naming caffeine. However, the ethical principles that guide Jain conduct emphasize ahimsa (non-violence), self-control, and purity of mind.

• Most Jain authorities—across both Digambar and Shwetambar traditions—discourage the use of intoxicants and stimulants because they can dull judgment, disturb one’s mental balance, and lead to harm or attachment.
• Tea, coffee, and other caffeinated beverages are commonly avoided by practicing Jains today, especially among stricter followers. Some people might drink caffeine-free alternatives, but many still choose to abstain to maintain clarity of mind and discipline.

So, while not a blanket, explicit scriptural prohibition, the prevailing Jain stance is to avoid caffeine as part of a lifestyle aimed at non-violence, self-control, and spiritual clarity. If you have a specific tradition or community in mind (Digambar or Shwetambar) and want their precise stance, I can describe that tradition’s usual guidance in more detail.