SCVirus
Inhaling burned tobacco has an above average ability to cause cancer.
Common commercial cigarettes, in general, have other ingredients that become carcinogenic when burned.
Nicotine, while not directly cancer causing, depresses the immune response in the affected areas, increasing cancer risk in those areas. This also affects chew, gum, inhalers, etc. Due to the nature of the rapid regeneration of the mouth and throat, this is likely a significant factor in the increased caused risk for chewed tobacco.
Additionally, chewed tobacco can cause Leukoplakia, which increases the risk of Oral cancer.
Cancer risk (most to least): Smoking, chew/dip, inhalers, gum, snuff.
Of the people I commonly interact with, maybe 10% are 'geeks' (in the stereotypical sense) and the rest run the gambit, from cleptomania, to borderline psychotic to bipolar to disturbingly happy and sure of there own 'normalness' and everything inbetween.
I've learned something from these people: sanity, normality and reality, are all subjective; defining people into groups is pointless and damaging. Being sure of your own superiority for taking a more societally acceptable path no doubt is 'normal' to you, but there are many on this earth who would rather die a thousand deaths then spend more then the tiniest fraction of their lives coding or solving problems in a 'made up world'.
Do what makes you happy, or what makes you feel fufilled, or fill whatever else your need might be. But don't judge others for doing the same.
I do not know you, and cannot judge you, but I would recommend, however, that if you truely have a desire for knowledge, to endevour to understand why others choose the path of feel-goodism and why others shun the path of knowledge and understanding (and the many other paths for that matter, but this one is likely particularily relevent). (Look beyond, they are duped, or they have problem x)
The grandparent has dismissed what I said as 'crap' created by my 'unjustified feeling of the profundity[sic]'. Interestingly, since these words stemed from eastern religion, from philosophy and even from common sense and reasoning (as well as my own personal experiences, and the words and works of psychedelic researchers) all these things too must be 'crap' that could only make sense after the 'delusions of drug use', after all:
"Biggest argument against taking drugs: they'll make you think that crap like that is "wisdom"."
PS: The path of blind rejectionism may be comfortable, it may be culturally encoraged, but as history has shown, it is inevitably a dead-end route.
(I do not, of course, recommend anyone go out and try DMT without first experiencing other psychedelics in the order given, or in fact without doing the research.)
I highly recommend you do that research.
Psychedelic use is not to be taken lightly. It is not a form of recreation (shouldn't be), it is a method of deep introspection, of breaking down mental barriers, a journey within yourself (among other things which really cannot be explained until you have reached the state of understanding that usually occurs with mush or mescaline use. This too is not an absolute, but is common to most peoples 'route' in this journey.)
Use of entheogens is, of course, not the only route to these states, tantric yoga can perform the same function as cannabis, and years (or decades) of deep meditation can take replace the use of mush, LSD and DMT.
Hedonism is best served occasionally.
Go with the flow atleast until you understand it.
Some voices are answers, others are questions.
All things are relative.
All things are subjective.
It is only possible to have a bad trip if you convince yourself/believe/decide you are having a bad trip.
Take _nothing_ for granted or as absolute.
Words are unreliable.
Do not be afraid to depreciate the mental monologue.
Do not be afraid.
Take mush (of the psilocybin variety) until you understand the nature of the change in consciousness created by the mary jane.
(you can try mescaline anytime after mush if you so wish, it will likely help you either understand the changes or find the connection, but would likely be counterproductive before mush is taken in a significant dose)
Take LSD until you feel an unshakable connection to the universe (start with a massive dose, theres no time like the first, listen to The Beatles [anything after Help! is best] and The Doors for assistance 'breaking on through to the otherside').
Then smoke DMT until you reach 'DMT hyperspace'. (Do not let fire touch the DMT, only touch the flame to the glass [and even then not /right/ under the DMT] take big hits you gotta take 3 big hits and hold them in before you become unable to smoke [mildly difficult]; keep trying.)
At this point you will understand your consciousness in a way science could never teach you, and you won't have to ask us anything about what you should do, you will already know.