short version in or out of treatment a treatment provider (medical or mental) can not discuss their clients with anyone outside the treatment team....

that said should two treatment providers meet somewhere and they are or have been a part of someones treatment team they can discuss clients that they may in common,and they can discuss situations that may help each other with other clients.

if you are in the USA yes any treatment provider or non treatment provider can approach anyones family and friends to say hey I think so and so is suicidal. here in the USA we have laws that state there are special circumstances that go into play when someone is a danger to their self and others.

example if I am suicidal, harming myself or have plans to harm someone else my neighbors, my friends, my co workers, my boss, my therapists, my physicians and other people in my life are well within their rights to talk to each other and also are well with in their rights as an american to call the police or others in authority.

even in schools now they are teaching children if you know of someone who is a danger to their self or others to find someone you trust and tell so that that person who is suicidal, harming their self or may harm another can get the help that they need.

these special circumstance, zero tolerance laws were enacted when 9\11 happened and continue to build upon due to all the school and other violence that is going on in the USA, a lot of which traces back to someone knew the person who shot up a school or what ever was mentally ill, suicidal or other wise harming self or others.

as for the smoking weed well what happens in that case depends upon your states laws. if your state is not one of the states that has legalized it for medical or recreational usage anyone that may see you smoking it, whether its your treatment provider, ex treatment provider or family, friends, strangers can report you to the authorities.

Im not sure but its my understanding that in the states that have legalized recreational usage you cant smoke it out in public. only in your home. my suggestion is if you are in a state that has legalized it to contact your police department and they will tell you what the laws are about this and whether you can be out on the street smoking weed.