When writing, it's important to have a varied vocabulary to keep your content interesting and engaging. One phrase that often appears is "are subject to", but there are numerous synonyms to use instead. "Are prone to", "are vulnerable to", and "are exposed to" all convey a similar meaning. Additionally, "are at risk of", "are liable to", and "are open to" are other options to choose from. Using different synonyms for "are subject to" not only expands your vocabulary but also helps to avoid repetition in your writing. Remember, using synonyms can make a big difference in the impact of your message.