One of the possible causes is that nicotine in tobacco smoke leads to oxidative stress and hence insufficient oxygen is supplied to the skin, which results in tissue ischemia and blood vessel occlusion
Impact of point-of-sale tobacco display bans: Findings from the International Tobacco Control four country survey
the best way to check whether there is power at the exposed terminal lips of every fuse-use a test light: if there's power at one end but not at the other-the fuse is blown, and, in addition, it may be observed that the element between the terminals is melted
Funding This review was supported by the Department of Anesthesiology & Perioperative Medicine, Mayo Clinic, Rochester, MN, R01 grants HL138402 and HL142061 (CMP), and CCaTS-CBD Pilot Award for Team Science from Mayo Clinic (ERV)
People with BD taking hepatic enzyme-inducing drugs such as carbamazepine, oxcarbazepine or topiramate have an increased nicotine metabolism, possibly resulting in the urge of heavier smoking and making it more difficulty to quit smoking (68)