Many people practice CO₂ breathing with the Cardihaler for 2-5 minutes once daily or every other day. Some users prefer shorter or less frequent sessions depending on their comfort and goals. There is no single protocol—CO₂ tolerance varies between individuals. Start conservatively with low CO₂ settings and short sessions, increasing gradually over time. Consistent practice is more important than session intensity. Detailed guidance is provided in the Cardihaler user manual.
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