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29 The convergence of these danger signals informs the DC about inhaled material that poses an immediate threat to pulmonary tissues and activates a maturation program: DCs process sampled antigen, present it on major histocompatibility (MHC) molecules, and strongly increase T-cell costimulatory molecule expression on their surface

Filters also act as a barrier for larger particles, making the smoke feel less harsh on the throat and lungs

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But some people use vaporizers containing no nicotine at all, they just enjoy the flavors and blowing milky clouds on Instagram