Health experts largely agree that vapes - or e-cigarettes - are a good way to wean adults off smoking. This is because it is widely thought that vaping is substantially less harmful than smoking because there are far fewer toxins in vapes than in tobacco smoke. But the e-cigarette vapour that is inhaled can still contain chemicals, including nicotine, which is highly addictive. Scientists are looking into the potential health risks of vaping and they say it could be decades before the long-term effects are fully known. It is illegal to sell vapes to children and there are growing concerns that young people are becoming dependent on them.