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If you want to discuss your concerns about a person's possible drug use, it is best to approach them when they are sober and thinking clearly. Someone who is high on marijuana may have trouble communicating with you or following what you are trying to say. It's best to catch the person when they're in a relatively calm mood. If they've had a rough week, or the two of you have been fighting all day, it's probably better to hold off until the person is in a more positive state of mind. Attempting to talk when the person is in a bad mood can make them more defensive, which means the conversation probably won't be very productive. Depending on the type of relationship you have with the person, you may be able to ask up-front if they are using marijuana. Keep your approach simple, straightforward, and non-judgmental. For example, you might say, “Hey, you've been acting different lately, and I noticed a funny smell in your room. Have you been smoking marijuana?” If the person thinks you are angry at them or judging them, they are less likely to open up to you. Make it clear that you are sympathetic and just want to help. For example, when talking to a friend, you might say, “I noticed you've been canceling a lot when we try to make plans, and you always seem so tired when I see you. Are you doing ok? I've been really worried about you!” Panicking or getting angry is usually counterproductive. Talk to the person calmly, without raising your voice, making threats, or being sarcastic. If you approach them in a hostile or fearful way, they will be less likely to open up to you, and the situation may become worse.
Wait until the person is sober to talk about it. Pick a time to talk when the person is calm and relaxed. Ask them if they are using marijuana. Let them know you are concerned about them. Stay calm.