吸烟跟掉发有直接的关系吗？ 
吸烟会影响人体的免疫系统、加速皮肤的老化、影响血液的循环，也有研究显示，吸烟会抑制毛囊细胞的分裂。北医公卫系韩柏柽教授指出，吸烟或吸入二手烟皆有害，根据国外研究，烟内有毒物质除有致癌危机，里头的尼古丁、古丁宁等有害物质会因吸入残留头发内，与造成掉发有关。且吸烟会直接妨碍妇女雌性激素的分泌，可能让雄性秃患者的掉发情况更加严重！ 
即使吸烟对毛囊的影响并未能够有更完整的科学研究，但至少确定的是，吸烟是会影响头发的健康。
还是及早戒烟或是尽量减少烟量啰！
以下节录世界卫生组织的文章，文章第一段就指出吸烟会导致掉发！ 
The Smoker’s Body 
Every 8  seconds someone dies from tobacco use, says the World Health  Organization. Research suggests that people who start smoking in their  teens (as more than 70 percent do) and continue for two decades or more  will die 20 to 25 years earlier than those who never light up. It is not  just lung cancer or heart disease that cause serious health problems  and death. Below, some of smoking’s less publicized side effects – from  head to toe.

1. Hair loss 掉发
Smoking  weakens the immune system, leaving the body more vulnerable to diseases  such as lupus erythematosus, which can cause hair loss, ulcerations in  the mouth and rashes on the face, scalp and hands.
收烟会消弱人体的免疫系统，让身体更容易受到红斑狼疮等疾病的侵袭，进而导致掉发、嘴部的溃疡以及头皮、脸、手的皮疹。
2. Cataracts 白内障
Smoking is believed to cause or worsen  several eye conditions. Smokers have a 40 percent higher rate of  cataracts, a clouding of the eye’s lens that blocks light and may lead  to blindness. Smoke causes cataracts in two ways: by irritating the eyes  and by releasing chemicals into the lungs that then travel up the  bloodstream to the eyes. Smoking is also associated with age-related  macular degeneration, an incurable eye disease caused by the  deterioration of the central portion of the retina, known as the macula.  The macula is responsible for focusing central vision in the eye and  controls our ability to read, drive a car, recognize faces or colors,  and see objects in fine detail. 
3. Wrinkling 皱纹
Smoking  prematurely ages skin by wearing away proteins that give it elasticity,  depleting it of vitamin A and restricting blood flow. Smokers’ skin is  dry, leathery and etched with tiny lines, especially around the lips and  eyes. 
4. Hearing loss 丧失听力
Because  smoking creates plaque on blood vessel walls, decreasing blood flow to  the inner ear, smokers can lose their hearing earlier than non-smokers  and are more susceptible to hearing loss caused by ear infections or  loud noise. Smokers are also three times more likely than non-smokers to  get middle ear infections that can lead to further complications such  as meningitis and facial paralysis.
5. Skin cancer 皮肤癌
Smoking  does not cause melanoma (a sometimes deadly form of skin cancer), but  it does increase the chances of dying from it. Smokers have a two-fold  increased risk of contracting