Like too many in Bangkok, Solid is, unfortunately, an ashtray bar.
Being small, it soon stinks with only 1 or 2 smokers.
The boys no longer smoke in the bar. Several signs are displayed stating "No Smoking", but management allows these to be ignored by customers, some of whom seem quite inconsiderate.
The current mamasan/waiter/whatever claims personally not to like the smoking, but is complicit in allowing it.
Pity, as it can be a gem of a place, and I will keep going, but be cautious where I sit.