No, you don't. Cigarette smoke stinks, and nonsmokers can sense it even in little amounts hours later. Even if you blow the smoke out the window, the smoke from the cigarette's end will still fill the room. Also, some people are allergic to tobacco products; if you have allergies, then smoking might not be for you. In fact, smoking in the shower is very bad for your health. Not only does this affect how others feel about your ability to cleanse their bodies with soap and water, but it also increases your risk of developing diseases such as cancer. Smoking in the shower is dangerous because it traps toxic chemicals that leak from the cigarette's filter inside the tub where they cannot be washed away. Over time, these chemicals enter the bloodstream through skin contact or inhalation. They have been known to cause cancers of the lungs, mouth, throat, bladder, kidney, colon, prostate, and breast. Cigarettes contain over 4,000 chemicals, many of which are known carcinogens. Smoking also increases your risk of developing heart disease, respiratory problems, stroke, osteoporosis, and gum disease. If you're going to smoke anyway, at least do so in a way that doesn't hurt others.