2:195 (Y. Ali) And spend of your substance in the cause of Allah, and make not your own hands contribute to (your) destruction; but do good; for Allah loveth those who do good.
4:29 (Y. Ali) O ye who believe! Eat not up your property among yourselves in vanities: But let there be amongst you Traffic and trade by mutual good-will: Nor kill (or destroy) yourselves: for verily Allah hath been to you Most Merciful!
157 (Y. Ali) “Those who follow the apostle, the unlettered Prophet, whom they find mentioned in their own (scriptures),- in the law and the Gospel;- for he commands them what is just and forbids them what is evil; he allows them as lawful what is good (and pure) and prohibits them from what is bad (and impure); He releases them from their heavy burdens and from the yokes that are upon them. So it is those who believe in him, honour him, help him, and follow the light which is sent down with him,- it is they who will prosper.”
33:58 (Y. Ali) And those who annoy believing men and women undeservedly, bear (on themselves) a calumny and a glaring sin.
Prophet(SAW) said: No harm may be inflicted on oneself or others.(Ahmad and Ibn Maajah)
Prophet(SAW) said: Whoever consumes poison, killing himself with it, then he will he consuming his poison in the hellfire, and he will abide in it permanently and eternally. (Bukhari)
Prophet (SAW) said: Allah hates for you three things: gossiping, begging, and wasting money
How to Quit Smoking Cigarettes – Easy Method
1. Niyyah – Make Your Intention It is first recommended to make the firm intention, from deep in your heart, to give up this evil habit. Trust in Allah’s words: “…When you have taken a decision, put your trust in Allah. For Allah loves those who put their trust in Him. If Allah help you, none can overcome you; if He forsakes you, who is it – after that – that can help you? In Allah, then, let believers put their trust” (Qur’an 3:159-160).
2. Change Your Habits – you must avoid situations where you are used to smoking, and people who do so around you. For example, if you have certain friends who gather together to smoke, make a choice to stay away from that environment for the time being. At a vulnerable stage, it is too easy to relapse by having “just one.” Remember, tobacco causes a physical addiction and you must stay away completely.
3. Find Alternatives -drink a lot of water and keep yourself busy in other endeavors. Spend time in the mosque. Play sports. Pray. Spend time with your family and non-smoking friends. And remember the words of Allah: “And those who strive hard in Our Cause, We will certainly guide them to Our Paths, for verily Allah is with those who do right” (Qur’an 29:69).
source: Smoking in Islam