Please choose the correct ending to complete the given sentence: Health: [header] How to smoke [title] Buy a pack of cigarettes. [step] In the united states, you must be 18 years old in most states in order to purchase a pack of cigarettes, although some states have different age requirements. In utah, for example, you must be 19 years old to purchase nicotine products.

Ending1: [substeps] Cigarette smoke typically comes in two types: vapor and nonvapor. The vapor induces the tobacco to smell sour and pungent. Ending2: Always present government issued id when buying a pack. There are many different kinds of cigarettes, so choose which kind you want carefully. Ending3: [title] Purchase a disposable cigarette pack for all tobacco products that you smoke. [step] Disposable cigarettes are available at craft and tobacco stores, convenience stores, or from online retailers. Ending4: [title] Access the tobacco section of the grocery store. [step] The tobacco sections of grocery stores will often have nicotine test kits at the registers.

Answer format: ending1/ending2/ending3/ending4