Two sides of an argument

Give the other side's opinion, and then give YOUR opinion

Give the other side
Some people think that…  
Although many people feel that…  
It is claimed that…  
Some people feel that…  

One sentence (While, although)
While it is true that… … I believe…
Despite the fact that millions of people die every year from lung cancer, many people think it is cool to smoke.
Although many people think that…., I feel that
Although it is often said that…, in fact the opposite is true
 
Two sentences
It is undoubtedly true that… …However…
It is often argued that… However, it is
Some people say that… They claim… However, I feel…
Supporters of this viewpoint say that… However, it is

One sentence (While, although)
While it is true that… … I believe…
Despite the fact that millions of people die every year from lung cancer, many people think it is cool to smoke.
Although many people think that…., I feel that
Although it is often said that…, in fact the opposite is true