Welcome to HCM. I had gone through your question and understand your concerns.
The relation between smoking
shisha and hyperthyroidism
is that smoking will worsen your thyroid eye disease
. So it is always suggested to stop smoking in hyperthyroidism. If you don't have eye disease of hyperthyroidism (Graves ophthalmopathy) you may well get away with this.
Hope I have answered your question. If you have any further questions I will be happy to help.
Dr Ajish TP