My husband is having severe chest pains. he just quit smoking 24 hours ago. he's 33 years old & in great shape. should i be worried?

Don't worry: But, support him. If he is more worried than you are used to - don't minimize his feelings and offer to take him to an urgent care or ER. He's not likely to be having a medical crisis - but middle aged men do have heart attacks. Again, it's not likely and would not be connected to quitting. It's more that he's having w/drawal efx and they can be hard. I'll write a breath suggestion in a comment.