Of course, many times! But anytime I am trying to get deeper into the topic, I am overwhelmed by the important details and I am afraid I am not really smart/knowledgeable enough to reliably avoid getting ripped off. Most articles I have came across had more or less prominent, detectable aura of marketing speak that makes me immediately suspicious.
They write long paragraphs about how there are many types of air purifiers/filters/masks and how these types are worse or better at doing their job, and surprise surprise, the best of the best is of course the product that they are selling.