How can one advise someone who has abandoned prayer and a smoker, in a way that doesn't hurt their feelings, especially if the smoker is older?

Advising someone who abandons prayer involves explaining its virtues and the danger of neglecting it, supporting this with evidence from verses, hadiths, and the statements of scholars, and potentially gifting them materials that address this matter. As for the smoker, advise them by clarifying the harms of smoking and its prohibition, using a kind and gentle approach that shows care and love for them, and that the advice is part of enjoining good and forbidding evil.