McNeil, et al., Evidence review of e-cigarettes and heated tobacco products 2018, Public Health England , February 2018, [iv] Royal College of Physicians, Nicotine without Smoke: Tobacco Harm Reduction , April, 2016, [v] Committee on the Review of the Health Effects of Electronic Nicotine Delivery Systems, Public Health Consequences of E-Cigarettes, The National Academies of Science, Engineering, and Medicine , 2018, [vi] American Cancer Society, What Do We Know About E-cigarettes?, June 19, 2019, [vii]American Lung Foundation, Whats In a Cigarette?, February 20, 2019, [viii] Centers for Disease Control and Prevention, Health Effects of Cigarette Smoking, January 17, 2018, fact_sheets/health_effects/effects_cig_smoking/index.html
All of these problems make it more difficult for couples to get pregnant naturally
First of all, passive smoking may be just as bad for ones health as regular smoking

Smoking-Induced Oxidative Stress in Bone: The Effects on Bone Turnover Jlia Benini Kohler 1 , Jader Joel Machado Junqueira 1 , Taysa Cristiane Moreira da Silva 3 , Marco Antonio Gonalves Pontes Filho 3,4 , Iolanda De Ftima L C Tibrio 1 , Fernanda Degobbi T Q S Lopes 1 , Alexandre Pvoa Barbosa 1,2* 1 Department of Medicine, Laboratory of Experimental Therapeutics (LIM-20), School of Medicine, University of Sao Paulo, Sao Paulo, Brazil 2 Department of Orthopaedics, Hospital do Corao - SP Brazil 3 Department of Rheumatology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil 4 Departments of Orthopaedics and Rheumatology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil Abstract Despite of clinical evidence of increased incidence of bone diseases amongst smokers as well as worsening recovery in orthopedic surgeries, it is still unclear which pathological mechanisms are induced by smoking and how these events impair bone turnover

In the 1970s, half of men and 40% of women over the age of 16 reported smoking cigarettes
however, if you use too much, it could be excessively acidic, harming the tooth enamel