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I take Sunmed Beyond, they have low THC under 3% so you can take them on planes inside the United States. The THC is derived from hemp, not marijuana plants. The bonus is that I have no grogginess the next day & it’s actually helped me with anxiety, as well. I take one an hour before going to bed. Please note that I do not have breathing issues unless I am doing strenuous activity. If you do, then please check with a doctor before taking. They don’t affect my breathing, but everyone is different. Let us know if you find something that works. Good luck!