HA's are not for rehabilitating people back into society, it is social housing and the rent is cheaper than a private landlord.
you cannot stop someone smoking in their own home - even if the smoke and smell goes to your flat.
you can report him for abusive behaviour i.e. banging on your door and threatening you - if that is what he did.
You cannot complain about hearing his conversations - that's just shitty soundproofing, you can complain if he is deliberatley too noisy.
If you know the name of the housing association, ring them up and complain. they might send you out some diary sheets.
this man might be on a 'starter' tenancy if he has been there under a year - although not all housing associations do this - on a starter tenancy you have to be on your best behaviour or your tenancy will not be extended - it would be worth asking the housing association about this.
If he is very noisy - loud music, shouting etc, you can call environmental health and ask them to monitor the noise. they ehave an emergency weekend number.
threatening behaviour is the police. - then report to housing association.
never make the assumption that the guy from environmental health (council) will talk to police or housing association - or that the police will talk to housing association or that the housing association will talk to them!
report report report.
you should always think of it like this - if it were too easy to evict someone, good people such as yourselves would be subject to the same laws and injustices could take place. therefore it is rightly hard to evict someone from their home and much evidence needs to be compiled before a judge will even countenance it.
This guy might have some support needs - or mental health difficulties - now the Housing officer will not tell you this, but any report should trigger them to make contact with the appropriate agencies
i work for a HA - any more questions let me know.