2nd and 3rd hand meth contact has had little research, however it is generally safe to assume that chronic ,or long term exporsure has similar risks to 1st hand use – perhaps on a smaller scale.
Methamphetamine in pure form is a white crystalline substance which vapourises when heating – most meth users smoke the crystals. When smoked, the vapour spreads and reforms on surfaces as crystal. This can then be ingested by contact through skin, or by coming into contact with surfaces through mouth, eyes and nose.
It can be difficult to prove the origin of illness when it is related to a contaminated surface or home, as the symptoms may seem fairly common to most.