From Wikipedia I could find a study, prompted by certain phrases used by Shakespeare in the 16th/17th century, finding traces of cannabis in pipes buried in Shakespeare's home town: Why write I still all one, ever the same, And keep invention in a noted weed, Shakespeare, Sonnet 76 However, even if this does indicate that marijuana consumption wasn't unknown in England before Carroll's days (which it does very weakly) it still doesn't imply that Lewis Carroll himself smoked marijuana (despite extremely flaky claims such as the fifth paragraph here), or that he was familiar enough with the habit to insert it into his rather hallucinogenic fantasy world
Smoke particles soak deep into your seats, carpets, headliner, and vents
But we cant simply look at the death count to get an understanding of the widespread health effects caused by smoking, as for every death, there are at least 30 more people continuing to suffer with a serious illness brought on by the habit
Instead, a comprehensive approach is necessary to address the individual's drug use patterns and related medical, mental, and social problems