Thanks for writing in.
If your son's brain tumor
has been in remission since 2006 and has also got a VP shunting done, then he is on the path of recovery. As more than 5 years have passed since treatment was first started, it is a good response to therapy.
Coming to smoking
and alcohol, there might have been some post treatment effects on the brain due to the treatment of the brain tumor. On taking alcohol or smoking pot, the rehabilitation
of a brain tumor patient gets affected. His higher mental functions and fine motor areas including temporal lobe
structures and limbic system
might get affected.
Hope this helps.