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For years, we鈥檝e talked about . It makes asthma worse, increases the risk of respiratory and ear infections 鈥� and even increases the risk of sudden death in infants. We鈥檝e had all sorts of educational campaigns for parents and caregivers, and have made some progress: between 2002 and 2015, of children less than 18 years old dropped from 27.6% to 20.2%.聽But now there is a new problem: secondhand marijuana smoke.

that when you are around someone who is smoking marijuana, the smoke gets into your system too. How much of it gets in depends on how close the person is, how many people are smoking and how much, how long you spend near them, and how much ventilation there is in the space. But research is clear that cannabinoids, the chemicals that cause the 鈥渉igh,鈥� get into the bodies of people nearby 鈥� including children.

During the same time period that cigarette smoking around children came down more than 7%, marijuana smoking around children went up nearly 5%. With more and more states legalizing marijuana for recreational use, that number is likely to continue going up.

This is not good. Besides the fact that we don鈥檛 want children getting high, or exposed to the dangers of inhaled secondhand marijuana smoke, there is the additional concern about long-term effects on the brain. While , there is evidence to suggest that when youth and young adults (whose brains are still developing) are exposed to marijuana, it may have permanent effects on , memory, and even IQ.

This is not what we want for our children.

All the advice we give to parents who smoke tobacco applies to parents who smoke marijuana, including:

• The best thing for you and your child is to not smoke at all. Talk to your doctor about ways to quit.
• If you do smoke, don鈥檛 smoke around your child, ever.
• Even if your child isn鈥檛 around, don鈥檛 smoke somewhere they will be, like your home or your car. Smoke lingers.
• After you smoke, change your clothes and wash up. Again: smoke lingers.

As legal use of marijuana grows more common, we need to create the same kinds of rules and laws we鈥檝e created to protect people from secondhand tobacco smoke.

Just because something is legal doesn鈥檛 mean it鈥檚 safe. And when we make choices that have risks, it鈥檚 not fair to impose those risks on other people 鈥� especially children, and especially when they could literally be harmed for the rest of their lives.

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