Dr. DHANUSHKA DISSANAYAKA Author of the book ‘Nikotin Lolithwaya Suwa Kirime Pahasu Maga’ Tobacco smoke contains many chemicals that are harmful to both smokers and nonsmokers. Of the more than 7,000 chemicals in tobacco smoke, at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide, and ammonia. Among the 250 known harmful […]