Alzheimer's risk doubles in heavy smokers

(Is there any logic to conclude that pot will not cause the same dementia late in life? None. All smokes (fumes from fire) are toxic and harmful)
Alzheimer's risk doubles in heavy smokers 
Oct 25, 2010, SASKATCHEWAN (CBC) - People who smoke heavily in middle age seem to more than double their risk of Alzheimer's disease and other forms of dementia late in life, research suggests.

Smoking is a well-established risk factor for stroke, but the link between smoking and risk of Alzheimer's and other types of dementia has been less clear since heavy smokers often die from other ailments before smoking's toll on the brain is evident...

Mental problems twice as likely for cannabis users: Dutch report

Oct. 4, 2010 (APF) THE HAGUE — Cannabis users suffer mental health problems twice as often as non-users, a study published Monday by Statistics Netherlands said.

"The percentage of people with a less good mental health is two times higher among cannabis users than non-users," CBS said in a statement.

The study, which was carried out between 2007 to 2009 and involved some 18,500 people, found that "20 percent of male cannabis users complained of mental problems, compared to 10 percent among non-users".