A 57-year-old man with a 35 pack-year smoking history and COPD is seen in primary care. He is contemplating quitting smoking. According to Canadian guidelines, which intervention offers the greatest likelihood of long-term abstinence?ABrief advice alone to quitBSelf-help materials onlyCCombination of behavioural counselling and pharmacotherapy (e.g., varenicline or NRT)DElectronic cigarettes without counsellingETelling him to quit abruptly without supportsCheck my answer