Marijuana Long-Term Side Effects — Texas DWI and Repeat Offender Risks

Cognitive and psychiatric effects

Long-term cannabis use produces:

• Cognitive effects. Memory and attention impairment, particularly in heavy users. Substantially reversible with sustained cessation but some persistent effects documented
• Adolescent brain development concerns. Use during adolescence associated with persistent cognitive effects more pronounced than adult-onset use
• Cannabis use disorder. 9% lifetime risk among users; 17% if use begins in adolescence
• Cannabis-induced psychosis. Acute psychotic episodes from heavy use, particularly high-THC products
• Schizophrenia risk. Increased risk in genetically predisposed individuals; debate continues about causation vs. association
• Anxiety and depression. Bidirectional relationship — cannabis can produce or worsen anxiety/depression; people with anxiety/depression are more likely to use cannabis
• Amotivational syndrome. Reduced goal-directed behavior in chronic heavy users
• Cannabis hyperemesis syndrome. Cyclic severe vomiting in some chronic users; only resolves with cannabis cessation

Physical health effects

• Pulmonary effects (smoked cannabis). Chronic bronchitis, increased risk of respiratory infections; lung cancer risk less clear than tobacco
• Cardiovascular effects. Increased heart rate during acute use; some evidence of increased cardiovascular event risk in chronic users
• Cannabis use disorder. Withdrawal symptoms include irritability, sleep disturbance, decreased appetite, restlessness
• Edible-specific risks. Severe acute reactions, hospital visits from overconsumption
• Pregnancy effects. Low birth weight, possible developmental effects
• Reproductive effects. Reduced sperm count, hormonal effects in chronic users
• Dependence. Physical and psychological dependence in chronic heavy users

Texas charging — escalating for repeat offenders

Texas marijuana law varies by form:

• Whole-plant marijuana (Penalty Group 1-A under §481.121): Class B misdemeanor (less than 2 oz), Class A (2-4 oz), state jail felony (4 oz – 5 lb), third-degree felony (5-50 lb), second-degree felony (50-2,000 lb), enhanced first-degree (over 2,000 lb)
• THC concentrates (Penalty Group 2 under §481.103): State jail felony minimum for any amount under §481.116. Edibles, vape cartridges, oils, wax, shatter all fall here
• Marijuana DWI: Texas Penal Code §49.04 applies to any impairing substance; THC-DWI follows standard DWI escalation

Repeat offender enhancements:

• Class B → Class A with prior conviction
• State jail felony enhanced to third-degree with prior state jail felony for drug offense
• Habitual offender status (§12.42) with two prior sequential felonies

Hemp defense and lab confirmation

Since 2019 Texas hemp legalization, the prosecution must quantitatively confirm Delta-9 THC content above 0.3% to prove marijuana. Practical implications:

• DPS lab quantitative testing required
• Many smaller marijuana cases declined for prosecution due to testing capacity limitations
• Hemp-derived products (CBD with trace THC) can produce ambiguous test results
• Defense angle: challenge prosecution's ability to prove substance is marijuana, not hemp

This has substantially reduced marijuana prosecutions in many Texas counties, but it has not affected:

• THC concentrate charges (treated as Penalty Group 2, separate from §481.121)
• Larger quantity cases where lab testing is proportionate to charge
• Distribution and commercial cases
• DWI cases where impairment is the question, not substance identity