Please choose the correct ending to complete the given sentence: Health: [header] How to blow smoke hearts [title] Choose a dense source of smoke. [step] A hookah may give the best results, followed by a cigar or tobacco pipe. Don't use something too harsh or too hot.

Ending1: You'll need to be able to hold the smoke for at least five seconds without coughing or exhaling. [substeps] Skip ahead to the next section if you already know how to blow a smoke ring. Ending2: [title] Add the hookah to the aircooled oven. [step] Wait a minute or two before closing the oven to give the incense time to take the smoke weight down and burn off in full. Ending3: You only need a source of the best smoke, preferably a cigar! [title] Find a sugar corn fireplace. [step] Hookah staffs spark a very large fire, but they have never been used in this form before. Ending4: It doesn't have to have anything flammable in it, but something close to the right temperature is good for your lungs. [substeps] Try to find a dense object like a tree and regular cardboard box.

Answer format: ending1/ending2/ending3/ending4