Some people mistakenly believe that Roll-your-own (RYO) cigarettes are less harmful than factory made cigarettes. This could be because they think that loose tobacco is more "natural". However, many of the 4000 chemicals in cigarette smoke come from burning the tobacco itself. These include tar that causes cancer.
Researchers believe that rollies are as harmful or even more harmful than smoking factory-made cigarettes! Studies show that RYO smokers tend to make cigarettes that contain high levels of tar and nicotine. They may also not use a filter. RYO smokers report inhaling smoke more deeply than factory-made cigarette smokers. There is also evidence that those who smoke rollies are more likely to develop cancers of the oesophagus and larynx than those who smoke factory made cigarettes.
There is no safe form of smoking. Any form of smoking harms nearly every organ in your body.