This is going to sound daft (and it is) but I struggled with it until I split it up as "taig" and "eis" which I think of as some sort of weird ice-cream for the irish. I know "taig" has sometimes been used in derogatory ways, but this is just a little internal mind prompt for myself. If you embrace the madness this sort of internal aide memoire process can work well - the dafter the better!
That's not necessarily true. There is nothing unsafe about sheep's lung. There was a perceived risk identified in 1971 but I cannot find any convincing argument as to what the risk to health was, and I have never heard of any ill effects from eating haggis. Therefore the suspicion exists that when America bans something for no obvious reason then there is some ulterior motive. There is no reason to suppose America would be anti-Scottish, but the fact that they have found a different reason for the ban does not prove what the motivation was. I simply don't know the real reason they banned it.
Because they are different verbs used for different purposes. When saying 'what' something is, i.e. 'it is , you use the copula, is, as in Is mise Daibhidh 'I am David'. Confusingly, the is has disappeared in this example with seo, so you are left without a verb. But when saying 'what something is like', i.e. 'it is , you use tha, called the substantive verb, in the unlikely event that a fancy name actually makes it any easier.