Can Vaporizer Cause Respiratory Problems?

Good night. My question is whether the use of a portable herbal vaporizer can cause respiratory problems. Inhaled steam is warm and when used fresh herbs are also moist. Thank you.
Expert answer:

In theory no, inhalation of vapor with medicines is used in medicine as a form of treatment, important is the care with the herbs used, some plants even being "natural" can be poisonous.

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