RT Journal
A1 Patel RB, Khazeni N
T1 LOng-term marijuana use and pulmonary function
JF JAMA
JO JAMA
YR 2012
FD May 2
VO 307
IS 17
SP 1796
OP 1797
DO 10.1001/jama.2012.3570
UL http://dx.doi.org/10.1001/jama.2012.3570
AB 
To the Editor: Dr Pletcher and colleagues1 studied the association between marijuana and pulmonary function over 20 years. Although all survey analyses can be limited by recall bias,2 the risk of bias in this study may be greater than usual. Cognitive deficits may exist in chronic marijuana users that are dose-dependent, with higher doses leading to poorer recall.3- 4 Such decline in long-term memory may result in inaccurate recollection of smoking frequency, particularly during the 10-year intervals between interviews in the Coronary Artery Risk Development in Young Adults (CARDIA) study population.