Living together with a partner who over-inflates can be emotionally stressful. It is possible that you have received signals for some time that your partner has a problem with cannabis, but it is also possible that you did not notice, or that you thought you were exaggerating ...
Some indications that you can consider:
If your partner or friend regularly 'blows' too often, it is definitely recommended to talk about this . Do that preferably at a time that he / she is not 'stoned'. Why does he / she use so much? - What is the function of that use? Are there positive reasons or is it rather to forget tensions?
Do not condemn or blame. Perhaps there is an opportunity to make clear that 'smoking' does not contribute to a solution, but that it often makes the problems worse.
Discuss the benefits of 'blowing'. This can take away the tensions and create space to also talk about the disadvantages.
You have the right to make clear to your partner which disadvantages you encounter from excessive use. Tell him or her what you think about it if agreements are not fulfilled, the atmosphere in the house is tense, no meaningful conversation can be held, too much money is spent, etc ... You do not even have to mention the use in this case.
You can also indicate that you are worried , and that you want to help as much as possible (but not to obscure the problems).
Keep taking good care of yourself . Keep doing the things that you liked before, avoid your circle of friends, do not stop with your hobbies and keep paying attention to the children.
Talk about it with someone you trust. You need to be able to view things from a distance. You can also call on professional help.
If there are children, they will sooner or later sense that something is wrong . They can also be directly confronted with the less attractive aspects of 'blowing' your partner. In that case, try to explain what is going on. You can do that best at a time when you are calm yourself. Try to talk at 'their level', so adapt to their age, but do not involve them in the relationship problems that you experience with your partner. You should do the latter better with your partner or with another adult you trust.
When the tensions rise high between you and your partner or if the problems last a long time, that can be undermining for yourself. You then begin to doubt everything, you have the feeling of turning in circles. These feelings are usually a sign that you are going over your border .