If you are not aware, there is a great proliferation of chemical abuse in urban environments. While 'scientific literature' has not acknoledged this, it is apparent that breathing this in will have a zero sum effect on information processing in the brain.
Having previously been made aware of this distressing fact it seems fair to disclose it to you having found a solution.
While 'you' may not notice drug abusers, by time spent in an evironment proximate, such as most UK cities, it will be experienced it due to the proportion of users.
Why should it bother 'you'?
If you are using novel strategies to cope with an SEN, such as Speech to Text, Text to Speech, it will be exceedingly apparent which synapses have been damaged.
This type of strategy is pointless when the brain is modified, in some cases hourly, by the all pervasive drug users.
If your relative is attempting to deal with SEN issues, keep them away from these effects. Regardless of the existential abhorrence of the idea, the issues caused by proximity are immediate, permanent, such is the nature of a chemical.
Move to a wealthier area. The denser the residence the more likely the exposure. In the UK it is up to 15%.
Keep windows closed! If you are not able to detect usage, do this, if you can, move. If you are tied into a tennancy, use plastic tape to seal around windows.
The point is maintaing a stable basis for adapting to the SEN need, ignoring the obvious existential abhorrence of it.
This is true for all types of SEN.
